Mr cool ductless

Mr cool ductless DEFAULT

Before You Buy

MRCOOL DIY Series Ductless Mini Split Air Conditioner & Heat Pump

MRCOOL DIY Series Ductless Mini Split Air Conditioner & Heat Pump


  • Product Comes In A Variety of Sizes Capable Of Cooling Rooms Up To Fifteen-Hundred Square Feet
  • Air Conditioner Comes With Full Heater As Well
  • Consumers Have Stated That These Are Some Of The Quietest Systems They Have Ever Owned
  • Five Year Parts Warranty & Seven Year Compressor Warranty


  • Can Be Difficult To Install, You May Need Professional HVAC Help
  • The Cost On These Units Can Deter Some Consumers.
  • This Is The In Between Option For Users Unsure If They Want A Window Unit Or A Full AC System
  • Some Complaints Of Unit Not Working Out Of The Box, But Warranty Will Cover You

Buy Now!

A friend of mine is approaching retirement. He has just a few years left and he is already making plans. One of these plans of his was to purchase a small cottage in the Ozarks. For those of you who aren’t from Kansas City, the Ozarks are a few hours south of here and are very similar to Appalachia. There are lots of forests, rivers, and hunting to be had. The place he purchased came with over thirty acres to play around with. The home though was rather small at only around twelve-hundred square feet. The home was also very old and did not have a central air conditioning system. There was an old window unit in the living room that did a mediocre job of cooling the home but it didn’t help for the winter months, it didn’t reach the bedrooms, and it needed to be replaced anyways.

He brought this up a few weeks ago when we were having a few and I told him to look into getting a ductless system. You see a ductless system can give you significantly more power then a standard window or mobile air conditioner. Along with the additional power it is much less of an eye sore. I didn’t see the old window unit that he had at his home but I can only imagine what it looked like. You’ve all seen them. Those old rusted looking units that look like they could fall at any moment. A ductless system mounts to your interior wall and to the outside of your home. You don’t lose a window. You don’t have to cut a huge hole in your wall to fit the wall unit. All you need is a three to four inch hole to fit the refrigerant lines through and you are good to go!

Personally, I am a big fan of ductless systems. Obviously, I am going to go with a central unit first if it’s possible, but if it’s not then I am going for the ductless. Yes they are more expensive but you are getting a better product too. In this article we are going to take an in-depth look at one of these ductless systems, MRCool Do-It-Yourself Smart Air Conditioner and Heater.

Please note that this will be a comprehensive review. I will try and cover everything including sizing requirements, installation, product features, the pros, and the cons. You can expect a lot of reading on your part but at the end you will definitely know what you are getting into and if this is the right product for you and your family.

Ok folks so before we get into the features and the pros/cons of these air conditioners from MRCOOL I want to cover a few topics: Sizing and Installation. These sections are key for when you are shopping for a ductless system. The sizing allows you to accurately predict exactly what size air conditioner that you need and the install section will give you an idea of what to expect when the air conditioner arrives at your home.


Before you buy we need to understand how sizing in air conditioning system works. It is not as simple as just picking the biggest and baddest model on the market. If you purchase a unit that is rated to cool one-thousand square feet and you put it in your one-hundred and fifty square feet office your air conditioner is going to have difficulty extracting the humidity from the air as well as evenly distributing the cooler air. The end result will be hot and cool spots throughout the room. That isn’t even mentioning the increased monthly cost to run a much larger machine then you needed in the first place. This will leave you feeling frustrated due to the hot and cool spots as well as paying more money per month then you should be.

Now, if we do the inverse of this scenario and buy a smaller air conditioner for a much larger area your unit will be running constantly all day and night just trying to keep up by cooling the larger square footage. This will result in the room not being as cold as it should be as well as significantly increasing the energy bills for running your AC non-stop. Remember folks, air conditioners are supposed to hit a desired temperature, turn off, and then turn back on when the temperature begins to rise. If they are running constantly that means higher bills as well as quicker parts failure on the unit.

To understand air conditioner sizing you need to understand British Thermal Units, or BTUs. If you have already been looking online or in stores you have probably noticed that window air conditioners always have a BTU number in their description. BTUs are the traditional measurement unit of heat.  In the air conditioning world BTUs are a measurement of the cooling capacity of your window air conditioner. The bigger the number of BTUs the more powerful and the higher cooling capacity of your A/C unit.  As a standard measurement an air conditioner needs around thirty BTUs for each square foot of living space that you wish to cool. Using that standard measurement let’s do some match based off of the 24,000 BTU rating example we pulled from earlier.

24,000 / 30 = 800 square feet

To ensure that you are buying the right sized air conditioner for your room it is best to measure it. To get the square footage of your room measure the width and depth of your room and then multiply the numbers together to get your square footage. As an example if you have a ten foot by eleven foot room you have one-hundred and ten square foot.

There are also other considerations when looking at your room. Yes, the size of the room definitely matters but these other scenarios could have a play into what kind of air conditioner you should purchase such as is the room sunny all day? How many people will be in the room at a time? How tall is the ceiling? Is the room in the kitchen or other hot appliance? All of these are signs that you need to increase the BTUs for your air conditioner.

The MRCOOL Ductless Systems come in a variety of sizes. To give you a better idea of what square footage they all fall under we’ve broken it down for you below. Just keep in mind folks that if you have some of the exceptions we mentioned above that you will need to increase the BTUs required.


This product is marketed as a do-it-yourself project. While that is great and doing it yourself can save you a bundle when it comes to hiring a professional HVAC technician, you should know exactly what you are getting into before you purchase. Doing it yourself doesn’t mean it’s going to be easy and if you guess your way through it then you not only risk voiding your warranty but you could also end up harming yourself or others when it comes to the electrical work. If you do wish to install the unit yourself then please continue reading on exactly what will need to be done.

First, the good news is that everything is included in the kit including a detailed installation manual. This manual can also be found at the bottom of this article under our ‘Important Link’s section if you wish to view an online copy. It should be noted that this kit does NOT come with exterior mounting brackets and superficial coverings. If you wish to go this route you will have to purchase these extra. The right brackets and coverings though can easily be found on Amazon by clicking here for the brackets and here for the coverings. The coverings are more aesthetic then anything, but they can provide an extra bit of protection to your lines. It is up to you if you want the extra expense or not.MRCOOL DIY Series Ductless Mini Split Air Conditioner & Heat Pump1

Now, for the install there are four main sections that will have to be done. The first two are the easiest. When you order this product you will receive an indoor section and an outdoor section. The outside section can either be mounted against your home using support brackets or it can be installed at ground level as long as you create a completely level floor pad. Most folks opt for the floor pad option as it is overall easier to install this way and if you have to do maintenance on the unit down the road you will have much easier access. Creating the floor pad can be done with bricks, cinder blocks, or even your own concrete pad.

The inside unit will need to be mounted up against an exterior wall. Some folks have done interior walls, and while yes it is possible… I would not recommend it. Remember, that once the interior section is mounted you will need to connect the refrigerant pipes and the condensation line to the outside unit. This is why it makes sense to have them on the other side of the wall.

When mounting the interior unit be sure to mount it high up against the wall, close to the ceiling. This is done for two main reasons. The first is that the fan or blower is located at the bottom of the unit. So, the higher the unit is mounted in the room the more easily the air can be distributed. If you have it towards the bottom of the room then all your cold air is blowing up against the floor. The other reason is the condensation line. This is where the water will drain through when excess humidity is removed from your home. This line is gravity fed so if your unit is floor level that water will have nowhere to go.

Alright folks so now we have the easy parts covered. The next point, and a tricky point for a lot of folks, is feeding the refrigerant and condensation lines through your home and connecting them to the exterior section. In order to do this you will need to cut a three and a half inch hole in the wall nearby where you have chosen to mount your interior unit. This is where you will feed the lines. When planning this out you should note that the MRCOOL unit comes with twenty-five feet of refrigerant line. To some this amount of piping is a blessing and to others a cruse. If you only have about ten feet needed then you have to be creative and find a way to ‘hide’ the other fifteen feet.

This unit from MRCOOL comes precharged with refrigerant. What that means is that the system is ready to go and no vacuuming or charging of the system is required. While this is a great pro it can also be a detriment as you have to be extra careful when routing these refrigerant lines through the hole and to the outside unit. Make no mistake, this is the hardest part of the install. You can NOT bend the lines. You can NOT cut or modify the tubing. If any of this occurs and a crack or leak forms in the tubing then all of the refrigerant will leak out and you will have a useless machine. If this does happen then you need to identify the source of the leak, patch it, and then charge your system again with refrigerant. You will most likely need a HVAC professional’s help in this scenario. But, hopefully it doesn’t come to this and you are very careful with the piping.

Once the tubing has been routed through the hole and both sections have been mounted you are now ready to seal the three and a half inch hole we made earlier. A lot of folks used weather proof insulation. I like the spray foam that expands. Either way, you need to seal this hole up to prevent drafts, water, and anything else from getting in there.

Alright folks, the last section of the install is the electrical portion. The twelve-thousand BTU unit requires a one-hundred and ten connection whereas the larger sizes require a two-hundred and twenty volt connection. Please note that regardless of what size of ductless system you choose it will have to be hardwired to your circuit box either through a one-hundred and ten or a two-hundred and twenty volt connection. Now, I’ll be completely honest with you here folks, I do not have much electrical expertise and it would be wrong for me to steer you a certain way for the install. From my research though I have found that you need a fifteen amp breaker for the smaller twelve-thousand unit and a twenty amp breaker for the larger sizes. Now, as to how to install these and connect them I am not knowledgeable enough to guide you. If you are not familiar with how to do this then I would recommend reaching out to an electrician once you have the unit itself setup and ready to go. It is best not to guess with electrical work and if you do it wrong then you risk voiding your warranty… not to mention harming yourself. Electricity is no joke.

Once you have finished the electrical work and everything else is done it is recommended by the manufacturer to run the air conditioner for ten to fifteen minutes and monitor the system for leaks. If the air conditioner passes then run the heater for ten to fifteen minutes as well. Note that the heater may take longer for it to truly start up so it may be best to let it run for a half-hour or so just to ensure everything is working as it should be. For any further questions or concerns when it comes to installation please click here to be taken to the official Mr Cool’s installation instructions. This should answer any questions that you have BEFORE you purchase.

Now that we have the sizing and installation sections covered we can begin to look at exactly what these products from MRCOOL have to offer. The first and most important point here is to recognize the various modes that these units come with. Each mode is important and can help you in making your purchasing decision. These units come with an Auto mode, a Cool mode, a Fan mode, and a Dry mode (Dehumidifier). Let’s take a look at these:

  • Cool – This is your air conditioning mode and can cool your home all the way down to sixty-two degrees. Although most folks prefer temperatures between sixty-eight to seventy degrees. This cool mode will work to cool your home even when outside temperatures range from five degrees to one-hundred and twenty-two degrees Fahrenheit.
  • Heat – These units from MRCOOL also come with a full heating mode. What is most exciting about this feature though is that the heater’s BTUs are mostly aligned with the air conditioners BTUs. What I mean by this is that in other air conditioners/heater combos you see the air conditioner has a significantly higher BTU number then the heater. This results in a far less powerful heater and requires you to have supplemental heat in your home along with this heater. But, with these units from MRCOOL the heater is very close the air conditioner BTUs. This heater will also work at maximum capacity with temperatures as low as five degrees Fahrenheit. Anything below five degrees then the heater will work but it will see diminished capacity.
  • Auto – The auto mode is pretty self explanatory. This is similar to most homes with a central system that have an auto mode. All this does is determine if the heater or air conditioner needs to be on. It will actively monitor the temperature in the room and turn one of these on to reach your desired temperature level. This is more of a hands off approach. I’ve never been a fan of auto myself. I like to have ‘heat’ mode in the winter and ‘cool’ mode in the summer, but that’s just my personal preference.
  • Dry Mode – Dry mode is actually just a dehumidifier mode. This allows you to dehumidify your home without cooling your home. I’m not sure how often you would use this as the air conditioner itself is a dehumidifier as well and most of the time if you are trying to dehumidify then you needing to cool as well. This dehumidifier will work between the inside temperature range of fifty to ninety degrees Fahrenheit. Outside temperature range between thirty-two to one-hundred and twenty-two degrees Fahrenheit.
  • Fan – The fan mode is just that. It is a fan without any cooling or heating effects. This is just the blower of the interior running and circulating air. This may be great to have if you have a fire in the fireplace and don’t necessarily want the heater on as well. The fan will help circulate the warm air without kicking that heater on.

Other Features

Along with your other basic modes that we mentioned above there are some other ancillary features that come with these Mr Cool air conditioners. These aren’t huge features but still good to know. The first is what’s known as the auto-restart. Let’s say for example it’s in the middle of summer and a bad storm rolls through the neighborhood and cuts power from your home. When power is restored at your home then your MRCOOL unit will turn back on and at the same settings it was at before. This is one less thing that you have to worry about resetting when your power comes back on.MRCOOL DIY Series Ductless Mini Split Air Conditioner & Heat Pump1

Another neat feature is what’s known as ‘louver angle memory.’ What this means is that when your appliance is turned off and then turned back on it will automatically remember the angle of the louvers from when it was last shut off. This is similar to the power loss feature we mentioned above. It ensures consistency when powering on your air conditioner.

This next one will be very important for those of you who elect to install this product yourself. Remember how I said earlier that you had to be very careful with the refrigerant lines and that you were not to bend them? If worse comes to worse and you do get a leak in your system the MRCOOL unit will actually alert you of said leak. If a refrigerant leak is occurring you will get an ‘EC’ error message come up on the inside unit. As to how to find the leak that is a whole other story. I did an article on this topic a few years ago which can be found by clicking here.

This product from MRCOOL comes with a remote and built in WiFi. The WiFi allows you to connect your phone to the appliance through the MRCOOL application. From here you have your own personal remote on your phone that will allow you to adjust temperatures, modes, and any other settings you require. The remote gives you the same functions as the phone app does but is overall easier to operate.

There are two extra features though on the remote though that I want to point out. The first is what is known as the ‘Follow Me’ function. This option will actually have the MRCOOL appliance read the temperature in the room where the remote is. So, if you have the inside unit setup in your living room but the remote is in your kitchen then it will keep running until the desired temperature is reached within the kitchen. This is a handy feature as it will give you a degree of separation between the cold air blowing and the thermostat itself. Otherwise, you will have the thermostat right next to where the cold air is coming out.

The last feature I’ll mention here is what is known as ‘Sleep Mode.’ This sleep mode is only accessible through the remote. When this is turned on the product will slowly adjust the temperature up or down every hour depending on if it’s in cool or heat mode. It will hold these temperature for seven hours and when the time is up it will revert back to it’s previous programmed temperature. This is a great function for you folks who want to save on your energy bills.

A lot of the pros on this product we have already covered in our product feature section, so there may be some repetition here. The biggest pro on these MRCOOL products are the various modes and the capacity of these modes. What I mean by that is you have a fully functioning air conditioner and a fully functioning heater that can work in temperatures as low as five degrees and up to temperatures of one-hundred and twenty-two degrees. This product has you covered. The only exception I would say is that if  you live in the far north and experience temperatures way below zero routinely throughout the year. Otherwise, this unit can handle whatever you throw at it.

The other big pro here is the warranty on the unit. These products come with a five year parts replacement warranty. Along with this you also get a seven year replacement warranty on the compressor. This keeps you covered in case of any your parts fail. The extra two years on the compressor is great as well as compressors are some of the most commonly failed parts when it comes to air conditioning. This warranty is much better then the competition. If you look at the Pioneer ductless system you will only find a two year parts warranty. Quite the difference if you ask me.

This warranty is NOT voided if you install this unit yourself. Remember folks, this is a do-it-yourself product. The only caveat here is that if you guess you way through the electrical work then you could void the warranty. If you are unsure on how to do the electrical connection then I would hire a professional to ensure you warranty stays in tact. For more on MRCOOL’s warranty click here to be taken to their official warranty page.MRCOOL DIY Series Ductless Mini Split Air Conditioner & Heat Pump1

The last pro I want to mention here is the overall volume of the unit. For those of you who have experience with window units you will know just how loud they can get during operation. You will not have this problem with this ductless system. No, these units are extremely quiet. In fact many folks don’t even realize the machine is on. It is that quiet.

We are now ready for the cons of this ductless system. Before I get into this though I first want to state that overall this is a great product and the cons I mention below are similar to what you find with other ductless systems. The big con here, especially on this MRCOOL system, is the expense. These units are very expensive, especially compared to some of the competing lines like the Pioneer model we mentioned in our pros section. The difference though is that with the MRCOOL brand you are getting a fully functioning heater whereas with the Pioneer you don’t get that same function. You also have less heater operating temperature range with the Pioneer unit. So, while this is more expensive you are getting more product and a higher quality product.

The other big con here is the install. Now this can be said with any ductless system. Do not be fooled, these are not an easy install. You have to mount both units. You have to feed the lines through… and you have to create a three and a half inch hole in your exterior wall. On top of all of that you have to connect it directly to your circuit breaker. Do you feel comfortable with all of that? If so, then this won’t be a big deal at all. But, if you are not then you either may want to hire a professional to help with the install or purchase a window or mobile unit that is much easier to just plug-in and go. The problem with the window/mobile units though is that their capacity is much lower and they are an eyesore.

The last few cons I want to mention are somewhat minor but still deserve to be mentioned. Some folks have stated problems with leaking refrigerant. While this can be a huge problem and will cause your unit not to work… it is most likely caused by poor install. They most likely bent the pipes or did something else to cause a fracture in the pipes which caused the refrigerant to leak out. Just be careful during install and follow the directions carefully. If you do this then you shouldn’t have this problem.

Remember the ‘follow me’ function we mentioned earlier? There were a few reviews that stated this wasn’t working properly. I only saw this a few times during my research, but the complaint was that the follow me function would try to reach the desired temperature through heat and cool in a back and forth fashion. In other words, if the temperature was set to seventy-two then cool would kick on to get it down to seventy-two… but then it accidentally goes down to seventy-one, so then the heater kicks on to get it back to seventy-two and then that accidentally goes to seventy-three. And so on and so on. This didn’t seem to be a prevalent complaint though so I don’t know much stock I would put into this.

The last con here is that some of the ductless systems are what’s known as a multi-zone system. This means that you can have one outdoor unit and multiple indoor units to cool your home in different rooms. These MRCOOL systems are NOT multi-zone. You only have one indoor unit and that is all you can have. If you need more then one then you will have to purchase the entire machine again.

Alright folks so we have gone through sizing, installation, features, pros, cons, and everything else there is to possibly know about this product. Bottom line is that this is a great product and will definitely do its job of cooling your home, garage, loft, workshop, or whatever other area you are looking at this for. But, don’t just take my word for it. If we look at we can see that this MRCOOL product has over two-hundred reviews on it all with an average rating of four and a half stars. That is the equivalent of a ninety percent approval rating. It is a solid product. If you’d like to purchase this unit please click here to be taken to our Amazon partner.

One last point of note here is that we here at RefrigerantHQ are not responsible for the install of this unit. If you purchase this product the installation process will be solely on you or a hired professional. If you are unsure on what to do rather it be through routing the refrigerant lines or doing electrical work then it is always best practice to contact a professional. You know what they say, it is always better to be safe then sorry.

Thanks for reading and I hope this review was helpful,

Alec Johnson



A ductless mini split heat pump can provide heating and cooling for your entire home, a single room, or supplement your current system. Installing one is also a perfect solution for an addition or attic conversion where it would be unrealistic to run ductwork.

Mini splits are also used in tiny homes, cabins, and RVs. Whatever your need, MRCOOL has a mini split that is right for your situation.

Did you know? All MRCOOL mini splits come with pre-charged line sets making them a fairly easy DIY project for the homeowner.  

In this article we will review the MRCOOL line of mini splits.  We provide a list below followed by reviews of these MRCOOL heat pump mini splits.

A buying guide follows for those who want full details on what to look for including available features, efficiencies, and coverage area.

Content Navigation

Top Picks for MRCOOL Mini Splits

We’ve put together a list of 7 MRCOOL mini splits with single and multi-room coverage abilities and BTU levels. There’s a mini split available that will meet your heating and cooling requirements.

Select the link on models you’d like to know more about, check current pricing, or purchase. Full reviews follow.

      Image                              Product


#1 MRCOOL DIY-18-HP-230B25 – 3rd Generation

  • Single Zone 18000 BTUs
  • 240V
  • Smart Technology – Google, Alexa, Android, Apple
  • Auto, Sleep, Timer Mode

Overall Best


#2 MRCOOL DIY-12-HP-115B25 – 3rd Generation

  • Single Zone 12000 BTUs
  • 115V
  • Smart – WiFi control with Alexa or Google
  • Variable Speed DC Inverter Compressor

Best Small Single Zone


#3 MRCOOL DIY-24-HP-230B25 – 3rd Generation

  • Single Zone 24000 BTUs
  • Easy DIY Pre-Charged Lines
  • Sleep, Auto, Timer Modes
  • Complete Smart Technology

Best Value

MRCOOL – DIY-36-HP-230B25

#4 MRCOOL DIY-36-HP-230B25 – 3rd Generation

  • Single Zone 36000 BTUs 
  • Smart Technology – Voice and App control
  • 240V
  • Low Ambient Cooling

Best Large Single Zone

27k BTU 22 SEER Multi-Zone MrCool DIY 2 Zone


  • Dual Zone 27000 BTUs
  • 240V
  • Variable Speed DC Inverter Compressor
  • Smart Technology – Voice and App control

Best Dual Zone



  • Tri-Zone  27000 BTUs
  • Triple Zone
  • Leakage Detection Alert– Detects Low Coolant
  • Smart Remotes

Best Triple Zone



  • Quad Zone 36000 BTUs
  • Variable Speed DC Inverter Compressor
  • 240V
  • Leakage Detection – Alerts you to Low Coolant

Best Quad Zone

MRCOOL Mini Split Reviews

There is much more detail here including pros, cons, features and ratings. See the link for many more user reviews and the current price.

Overall Best

#1 MRCOOL DIY-18-HP-230B - 3rd Generation

This single zone 18000 BTU mini split will heat and cool a space of up to 1000 sq. ft.


Reason it is on the list: This powerful unit will keep a large space comfortable with EnergyStar efficiency, Smart technology and excellent climate control features.

Most helpful user reviews:

Best pro: “Came well packed with clear directions and photos making installation easy. I absolutely love the phone app allowing me control from anywhere. Heats and cools my 1100 sq. ft. space. Highly recommended.”

Best con: “This is a DIY project but will take some skills and knowledge of hand tools, electrical, and concrete to build a solid pad. Cement, circuit breaker, and Romex are needed.”

Room Size: 650 – 1000 sq. ft.


  • Wireless Remote IR WiFi Thermostat
  • Smart HVAC App – Google, Alexa, Android, Apple Compatible
  • Outdoor Temperature Operating Range of 5F to 122F
  • Low Refrigerant and Filter Cleaning Alerts
  • 240V

Check Price on Amazon

  • Efficiency Rating: 4.8 – 20 SEER, EnergyStar certified
  • Customer Service Rating: 4.5 – MRCOOL provides friendly, helpful, tech support
  • Installation Rating: 4.6 – Unit includes complete instructions with photos
  • Value Rating: 5 – Dependable, efficient heating and cooling at a great price.
  • Warranty Rating: 4.8 – 7 years on compressor and 5 years on parts
  • Overall Rating: 4.8

Best Small Single Zone

#2 MRCOOL DIY-12-HP-115B25 - 3rd Generation

This 12000 BTU model offers the latest features available in a single zone mini split.


Reason it is on the list: Highly rated and highly efficient, this unit provides reliable comfort in a 500 sq. ft. space.

Most helpful user reviews:

Best pro: “Very nice, easy, weekend project. I liked it so much I bought a 2nd unit within 18 months. I’m impressed, it’s quiet and looks sharp.”

Best con: “While installation is relatively easy, you may need to purchase additional tools. At several points the directions contradicted themselves. YouTube videos were more helpful.”

Room Size: 350 - 650 sq. ft.


  • Sleep Mode and Follow Me Modes
  • Smart HVAC App – Google, Alexa, Android, Apple Compatible
  • Low Ambient Cooling
  • Low Refrigerant and Filter Cleaning Alerts
  • 115V

Check Price on Amazon

  • Efficiency Rating: 5 – 22 SEER, EnergyStar certified
  • Customer Service Rating: 4.5 – Friendly, helpful, tech support
  • Installation Rating: 4.2 – Reasonably easy but may need additional tools
  • Value Rating: 4.8 – Well made, reliable, and efficient at a fair price
  • Warranty Rating: 4.8 – 7 years on compressor and 5 years on parts
  • Overall Rating: 4.7

Best Value

#3 MRCOOL DIY-24-HP-230B25 - 3rd Generation

This mid-size, single zone, 24000BTU unit is packed with all the features you’re looking for.


Reason it is on the list: This MRCOOL is rated Amazon’s #1 Best Seller for mini splits, and can keep a 1200 sq. ft. area comfortable in any outdoor temperature, and at a great price.

Most helpful user reviews:

Best pro: “The unit has been functioning flawlessly for 400 hours keeping my 1200 sq. ft. space comfortable. Very happy with MRCOOL, it just works.”

Best con: “Fairly easy to install but the directions that came with it didn’t exactly match up. It helps to have experience.”

Room Size: 750 - 1300 sq. ft.


  • Outdoor Temperature Operating Range of 5F to 122F
  • Smart HVAC App – Google, Alexa, Android, Apple Compatible
  • Very Efficient 20 SEER – EnergyStar certified
  • Low Refrigerant and Filter Cleaning Alerts
  • 230V

Check Price on Amazon

  • Efficiency Rating: 4.9 – 20 SEER EnergyStar certified
  • Customer Service Rating: 4.2 – Tech support is generally helpful
  • Installation Rating: 4.6 – Fairly easy installation
  • Value Rating: 4.8 – Provides excellent climate control and well worth the price
  • Warranty Rating: 4.8 – 7 years on compressor and 5 years on parts
  • Overall Rating: 4.8

Best Large Single Zone

#4 MRCOOL DIY-36-HP-230B25 - 3rd Generation

This 36000 BTU single zone unit provides reliable comfort to a very large space.

MRCOOL – DIY-36-HP-230B25

Reason it is on the list: This highly rated and powerful unit includes all the features you’ll need.

Most helpful user reviews:

Best pro: “Installed easily into my 30’x60’ shop. Easily holds temperature at 75F even when it’s 98F outside. Very quiet and works flawlessly. Great product.”

Best con: “Cools the space nicely and was easy to set up but the outdoor copper lines had a cheap Styrofoam covering. They should have had a rubber covering.”

Room Size: 1200-2000 sq. ft.


  • Outdoor Temperature Operating Range of 5F to 122F
  • Smart HVAC App – Google, Alexa, Android, Apple Compatible
  • Variable Speed DC Inverter reduces operating costs
  • Low Refrigerant and Filter Cleaning Alerts
  • 230V

Check Price on Amazon

  • Efficiency Rating: 4.4 – 16 SEER
  • Customer Service Rating: 4 – Some customers felt they were not as responsive as they should be.
  • Installation Rating: 4.5 – Easy DIY Installation
  • Value Rating: 4.7 – Provides excellent climate control and well worth the price
  • Warranty Rating: 4.8 – 7 years on compressor and 5 years on parts
  • Overall Rating: 4.5

Best Dual Zone


This 27000 BTU dual zone package with a condenser and two air handlers will provide comfort in two separate spaces.

27k BTU 22 SEER Multi-Zone MrCool DIY 2 Zone

Reason it is on the list: Smart, efficient, and quiet, this is the perfect unit when you need dual zone coverage.

User reviews – This unit is fulfilled by a third party and no customer reviews are available. MRCOOL generates very positive customer reviews on their other available mini splits.

Room Size: Will cover  2 rooms with up to 1500 combined sq. ft.

Air Handler Configuration: Package includes 9K and 12K BTU air handlers.


  • DIY Installation – Pre-Charged Lines
  • Smartphone App Controls – Digital Ready
  • Energy Efficient DC Inverter
  • Low Refrigerant and Filter Change Alerts
  • Lifetime Tech Support

Check Price on Amazon

  • Efficiency Rating: 4.8 – 22 SEER
  • Customer Service Rating: 4.5 – Friendly, knowledgeable customer service
  • Installation Rating: 4.6 – Relatively easy, no special tools required for DIY installation
  • Value Rating: 4.7 – Very efficient and provides a lot of comfort for the price
  • Warranty Rating: 4.8 – 7 years on compressor and 5 years on parts
  • Overall Rating: 4.7

Best Triple Zone


This 27000 BTU triple zone package includes a condenser and three air handlers.


Reason it is on the list: Quiet, efficient and can be controlled from anywhere with the smart app, this unit delivers excellent climate control in three areas.

User reviews – This unit is fulfilled by a third party and no customer reviews are included. MRCOOL generates very positive customer reviews on their other available mini splits.

Room Size: Can cover 3 rooms with up to 1500 combined sq. ft.

Air Handler Configuration: Package includes air handlers at  9K, 9K, and 12K BTUs.


  • DIY Installation – Pre-Charged Lines
  • Smartphone App Controls – Digital Ready
  • Completely customizable room temperatures – individual room remotes
  • Outdoor Temperature Operating Range of 5F to 122F
  • Quick Connect Values

Check Price on Amazon

  • Efficiency Rating: 4.8 – 22 SEER
  • Customer Service Rating: 4.5 – Friendly, knowledgeable customer service
  • Installation Rating: 4.6 -  Relatively easy, no special tools necessary
  • Value Rating: 4.6 – Efficient and provides a lot of comfort for the price
  • Warranty Rating: 4.8 – 7 years on compressor and 5 years on parts
  • Overall Rating: 4.6

Best Quad Zone


You can heat and cool 4 individual rooms with this powerful 36000 BTU model. Included are the condenser and four air handlers.


Reason it is on the list: This is a dependable, quiet, unit with the capacity to keep up to 2000 sq. ft. comfortable.

User reviews – This unit is fulfilled by a third party, so no user reviews are listed on Amazon. However, MRCOOL is one of the highest-rated mini split heat pump brands, especially when it comes to DIY units.

Room Size: Can cover 4 rooms with up to 2000 combined sq. ft.

Air Handler Configuration: Package includes air handlers at  9K, 9K, 12K and 12K BTUs.


  • DIY Installation – Pre-Charged Lines
  • Smartphone App Controls – Digital Ready
  • Completely customizable room temperatures – individual room remotes
  • 240V
  • 100% Sealed System

Check Price on Amazon

  • Efficiency Rating: 4.8 – 21.5 SEER
  • Customer Service Rating: 4.5 – Friendly, knowledgeable customer service
  • Installation Rating: 4.6 -  Relatively easy, no special tools necessary
  • Value Rating: 4.6 – Efficient and provides a lot of comfort for the price
  • Warranty Rating: 4.8 – 7 years on compressor and 5 years on parts
  • Overall Rating: 4.7

Mr Cool DIY Mini Split Buying Guide

If you’d like more information before purchasing a mini split, this Buying Guide with FAQ’s will provide you with some answers.

Who is MRCOOL?

MRCOOL was founded in 2014 and is headquartered in Hickory, Kentucky. It’s rise to becoming one of the top mini split heat pump brands has been swift. MRCOOL is known for its durable, reliable mini splits highly recommended by HVAC professionals. They are also the first heating and cooling manufacturer to make ductless mini splits that are truly DIY and can be easily installed by the homeowner without the need for specialized tools.

MRCOOL was a finalist in the Innovation category at the 2021 AHR (Air Conditioning, Heating, Refrigeration) Expo for their ground-breaking approach to ductless mini split DIY installation design which eliminates the need for in-field vacuuming and charging by an HVAC professional.

What is a Mini Split Heat Pump?

A mini split heat pump provides air conditioning, heat and dehumidification. The mini split name comes from the fact that they have two major components, the condenser is installed outside and one or more air handlers are installed inside. A mini split does not require ductwork.

There are single zone units that include the condenser and one air handler and multi-zone units that include the condenser and two to four indoor air handlers. Mini splits are available in a variety of BTU levels.

Why Purchase a Mini Split?

There are a variety of excellent reasons to consider a mini split. Following are some of the best reasons:

When you want to cool an area that doesn’t have existing ductwork. A mini split system is a great option for a home that uses radiant or hot water heating, but where part of the house isn’t adequately served.

A mini split can be used to supplement an existing system. Perhaps you have an area of your home that your existing system can’t keep comfortable, like an upstairs bedroom or basement. A mini split can supplement your existing system to make the area comfortable and without much added cost.

When you add new space to your home. Mini splits are perfect for additions and attic conversions and will save you the cost of adding expensive ductwork. Plus, your existing central HVAC system likely won’t have the capacity – if properly sized – to heat and cool the extra space in addition to what it’s already doing.

When you want to customize temperature control in individual rooms. Multi-zone mini splits allow you to control the temperature in each room or zone. The indoor air handler in each room is operated with its own thermostat and control.

You may need extra cooling in the kitchen during the day and more cooling in the bedroom at night. They are also good for a room that you only use occasionally, like a guest room. Using energy only where and when you need it will save you money on your energy bills.

Mini splits are excellent solutions for spaces where a central system isn’t possible. Mini splits can be used for heating and cooling  tiny homes, cabins, garages, offices, workshops, pole barns and even RVs.

What Size Mini Split Do I Need?

Knowing how many rooms you want to cover and their overall square footage is a good starting point. If you need a multi-zone system, consider whether the air handlers will always run simultaneously or not. Other factors include the layout of the space, the age of your home, and how well it’s insulated.

Note: For multi-zone units, the total BTUs of the condenser will be split between the air handlers in use at any given time. For instance, you can have a 27k BTU condenser with three 12k air handlers but they won’t all run at 12k at the same time. This would be a good choice if you only need two handlers running at full capacity at the same time.

MRCOOL mini splits are available with 12k to 36k BTU condensers and with one to four indoor air handlers. Below is a guide to BTUs and coverage areas.

A guide to BTUs and Room Coverage

Condenser BTUs

Sq. Ft. of Coverage Area

Unit Usage


500 – 650

Single Zone


650 – 1000

Single Zone


1000 – 1350

Single Zone


1100 – 1500

Dual or Tri Zone


1200 – 2000

Single, Dual, Tri, or Quad Zone

Can a Mini Split System Save Money on Energy Bills?

Yes, a mini split heat pump system can save you at least 30% on energy costs over window air conditioning units and central systems. Here’s why:

Heat transfer abilities. When in heating mode, mini splits transfer heat from outside into your home. They don’t generate it. As a result, they generate on average about three times more heat compared with the energy used. The most efficient furnace available now is the Lennox SLP98V with an impressive 98.7% fuel utilization efficiency. You could state the performance as a ratio of .987 to 1; for every unit of energy spent, you get .987% of it in heat. By contrast, ductless heat pumps average about 3.5 to 1. For every unit of electricity spent, they deliver 3.5 times more heat. This is called the Coefficient of Performance, or COP, if you’d like to do further research.

They are ductless. Mini splits do not lose cooled or warmed air through ductwork, like central systems do.

Did you know? In homes with older ductwork, an average of 30% of the treated air, whether it is heated or cooled/dehumidified, escapes through gaps and poorly insulated sheet metal. So, if you have a 95% gas furnace, it is suddenly reduced to a 65% furnace. This is one very important reason that ductless mini split heat pumps are growing in market share year after year after year.

Temperature customization. Mini splits allow you to tailor climate control in individual rooms at specific times. The entire house doesn’t have to be the same temperature at the same time.

Innovative technology. MRCOOL mini splits use technology that makes them extremely efficient, offering many units with SEER Ratings above 20. SEER stands for Seasonal Energy Efficiency Ratio and can be used as a guide to let you know how much comfort you get for every energy dollar you spend. The higher the SEER, the more efficient the unit.

A SEER rating above 17.5 is considered excellent.

EnergyStar. Many of the MRCOOL mini splits are EnergyStar certified meaning that they meet strict energy efficiency criteria set by the U.S. Department of Energy and are at least 25% more efficient than non-certified products.

Replacing older systems with an EnergyStar product can often make you eligible for a rebate from your local energy supplier. Really? Yes, really. Call your energy provider or check its website. If you want to explore this more, our partner contractors will give you full details on the savings for various heat pump models. Call 888-894-0154 or click here for details.

What Other Features Are Available?

The MRCOOL DIY mini splits include a Smart HVAC App, compatible with Google, Alexa, Apple, and Android, and include WiFi remote control. Install it on your phone, and monitor and control the thermostat from anywhere. This can save you a lot of money in a year. In summer, turn up the thermostat to 80 while you’re gone to save on energy costs. Then about an hour before you plan to get home, use the app to turn it down to 74, and the space will be cool, dry and comfortable when you arrive.

  • Low coolant and filter change alerts.
  • Follow Me Mode tracks the air temperature at the location of the remote. Think about that. If you keep the remote near you, then the unit won’t stop working until the remote – and you – are as cool or warm as you want to be.
  • Sleep Mode
  • Low ambient cooling capabilities for rooms that need cooling year round like server rooms and greenhouses.
  • Auto Restart will retain all of your programmable information in the event of a power outage.
  1. Cable dahmer chevrolet service
  2. Root android 11
  3. Girl monologues for auditions

Temperature control for thousands less
Because of the MRCOOL DIY®

Your Space At The Perfect Temperature

The only ductless air conditioning and heating unit that is easy to install for thousands less than a conventional HVAC system. MRCOOL DIY® even adjusts the temperature to the perfect degree wherever you are in your room.

Patented Easy DIY® Installation

Pre-Charged R-410a Quick Connect Lineset

Wireless Mini-Stat

Corrosion Resistance


with Single Zone DIY® Mini-Splits

- The New MRCOOL® Wireless Mini-Stat Smart App Controller -

Learn More...

Temperature Control
Down To The Degree

Easily control the temperature of your space from your phone or with the included remote control. The temperature adapts based on where you are in the room.

Quick Connect
No Expensive Tools Necessary

With our simple quick connect lines, you'll be able to install your MRCOOL DIY® without needing specialized training or expensive tools.

Mount & Connect
Easy Mount System

Getting your MRCOOL DIY® system mounted and ready to go is a snap away. Using our easy mount system you'll be ready to go in minutes instead of days.

Pick the perfect MRCOOL DIY® for your space

Every space is a little different. Whether your space is big or small we have the perfect MRCOOL DIY® so you can be totally comfortable in your space.


Cool / Heat up to 500 sqft.

  • Easy DIY Install

  • 7-year Compressor Warranty and 5-year Parts Warranty

  • Fast Shipping and Easy Returns


Cool/heat up to 750 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns


Cool/heat up to 1000 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns


Cool/heat up to 1500 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

Need an Option for Multiple Rooms?

Check out the NEW MRCOOL DIY® Multi-Zone Systems


No-pressure peace of mind.

Rest easy with MRCOOL DIY's 30 Day Money Back satisfaction guarantee, premium 7-year compressor warranty, 5-year parts warranty, and Energy Star certification.

7 year compressor warranty
7-Year Compressor Warranty
5 year parts warranty
5-Year Parts Warranty
fast and easy
Fast Shipping & Easy Returns*
ahri certified
AHRI Certified

* There will be a 15% restocking fee for accepted returns 30 days after the purchase date

Why people love MRCOOL DIY®

No duct work needed.

MRCOOL DIY doesn't require any expensive ductwork. Simply mount, connect, and enjoy.

Degree Temperature Control

Control the temperature of your space down to the degree using MRCOOL DIY's sensor technology.

DIY Install

Simply install MRCOOL DIY without the need for expensive tools or specialized training.

I use it to cool down a 432 square foot living area and from the start up to comfortable cool takes five minutes. I can honestly say it's the best air conditioner I ever installed for myself. I'm 72 years old and I installed it myself.


Let’s compare.

May the best AC & Heating system win.

No Duct Work

MRCOOL DIY® is ductless. This allows you to quickly install the MRCOOL DIY® unit into your space even if you don't have duct work in place. Avoid buying expensive tools and install it yourself.

Requires Expensive Ductwork

Conventional HVAC work requires installing expensive ductwork in your house, and ductwork repairs. This work typically costs thousands of dollars.

Cost Effective Equipment

From the start of your project to cooling your home, we will ensure that you are up and running with quality equipment, great cost savings and minimal effort.

Expensive Equipment & Utility Costs

HVAC equipment is expensive and often isn't optimized for utility costs. Don't be surprised if HVAC equipment runs you into the thousands of dollars even before installation fees and monthly utility costs.

DIY Installation

Simply follow instructions and install MRCOOL DIY® yourself in hours. No need to for specialized training or expensive tools.

Expensive Installation

Installing an HVAC system often requires several days of work and thousands of dollars in professional installation costs.

Not sure what size you need?

Every space is a little different. Whether your space is big or small we have the perfect MRCOOL DIY® so you can be totally comfortable in your space.


Cool / Heat up to 500 sqft.

  • Easy DIY Install

  • 7-year Compressor Warranty and 5-year Parts Warranty

  • Fast Shipping and Easy Returns


Cool/heat up to 750 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns


Cool/heat up to 1000 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns


Cool/heat up to 1500 sqft.

  • Easy DIY Install

  • 7-year compressor warranty and 5-year parts warranty

  • Fast Shipping and Easy Returns

Join thousands enjoying their space in comfort.

Over 1,560 verified customer reviews

This was the best purchase and project I've ever done

This was the best purchase and project I've ever done! That's why this is the first review I've ever taken the time to submit. Fantastic product - and the packaging was amazing.

Install is a couple of hours, not hundreds of dollars

I own 6 total mini-split units. All of the others I had to pay a licensed HVAC person to install them costing an additional $350-600 per unit. This Unit I installed by myself in just a couple of hours and it was up and running and cooling my shop.


I had my doubts about these simple DIY units, but after installing two of them, one of which ran very well for the entire summer, I'm a convert now.

Your MRCOOL DIY® questions, answered.

What exactly is the MRCOOL DIY®?

A MRCOOL DIY® Series heat pump is the only ductless mini-split system on the market explicitly designed for amateur installation. You don't need special tools or training to install this high efficiency heat pump. The line sets precharged with R-410A refrigerant, the quick hook-up electrical connections, and the quality engineering mean just about anyone can install a MRCOOL DIY® in their home with no problem at all in only a few short hours. If you want great air comfort without paying an arm and a leg for installation, you want an easy-to-use MRCOOL DIY® Series ductless heat pump.

  • Unlike any other ductless heat pump on the market, the MRCOOL DIY® series is specifically designed for easy installation, the MRCOOL DIY® series comes with precharged line sets alleviating 1 major obstacle to amateur installation in a single stroke.
  • 7-year compressor warranty and 5-year parts warranty
  • DC inverter and variable speed compressor technology cuts operating costs
  • Refrigerant leakage detection ensures your system remains operating efficiently without degradation due to undetected corrosion
  • MRCOOL DIY® temperature compensation technology help keeps you comfortable in any weather conditions

Are the indoor and outdoor components included?

Yes, both the indoor wall mounted air handler and the outdoor condenser are included, along with the line set and communicating wire to connect the two units.

How efficient is this unit at low temperatures such as 10- 20F?

So far the lowest temperature that I have experienced with this unit is -7 Celsius which is 19.4 Fahrenheit and it was still making adequate heat but it was noted that there was a reduction in the heat output. You should have a supplemental or backup heat source if you live in an area where you experience consistent temps near or below freezing!

Does the inside unit come with mounting brackets?

Yes, and a nice template to drill the holes for the mounting bracket.

Does the system include the communication wire to connect the indoor to the outdoor unit?

Yes, every MRCOOL DIY® includes the communication wire to connect the air handler, the indoor unit, and the condenser, the outdoor unit.

You’ll spend over 6000 hours in your space this year.
Be Comfortable.

Shop now

How Many Areas / Rooms do You Need to Heat / Cool?

How Many Square Feet is Your Area / Room?

  • We’ve added more information on DIY mini-splits, like Mr. Cool.

May 10, 2021

A mini-split is an efficient, scalable way to add cooling or heating to specific rooms of a home. Also known as ductless mini-split air conditioners and heaters, they consist of one or more wall, floor, or ceiling-mounted indoor units connected to an outdoor compressor. They’re easier to install than a full ducted system, more efficient than window units or central HVAC, and they often make sense as a supplement to your existing heating and cooling equipment—giving a boost to an isolated area of your home. Add in thermostat-like controls alongside smart-home integration and mini-splits start to sound pretty great—but they aren’t cheap, with installation costs that can reach into the five figures. (Many local utility companies offer rebates to offset some of that.)

The exact mini-split equipment you need depends on your home’s unique heating and cooling requirements, and your options are limited to the qualified installers in your area—but we’ve researched this topic enough to be able to tell you about the scenarios when mini-split systems make sense and how to decide among the brands available. We asked installers, manufacturers, and homeowners who have mini-split systems to tell us what anyone considering one would need to know.

Who should get this

If you want to cool or heat specific rooms with better efficiency and less clutter than window ACs and space heaters—and less complexity than central HVAC—consider a mini-split system. Central HVAC usually forces air through several rooms—or the entire house—often heating or cooling rooms that aren’t even being used. “If you turn the water faucet on in the kitchen and every other water faucet turned on throughout the efficient is that? That’s what central systems do,” says Mike Smith, senior marketing manager of Mitsubishi Electric, one of the prominent mini-split brands sold in North America.

Pros of a mini-split system

Mini-splits are popular as retrofits into existing construction, for a reason that also happens to be another big source of their efficiency: They don’t require costly duct work. This means they’re much easier to install than a traditional ducted HVAC system, and they can deliver more of the conditioned air they produce, too. According to Tim De Stasio, president of Southern Comfort Consulting and Service of Greensboro, North Carolina, “ductwork loses heat, especially in attics, and here in the South our attics can get up to 150 degrees.” This is not to say installation is simple, however.

Another appealing factor about a mini-split is a lot of flexibility in sizing the system to your needs. The system consists of two types of units: one outdoor condenser and the individually controlled air-delivering indoor units, which you have at least one of (or, maybe, four). These connect by a refrigerant line and a drain line. The indoor units vary in size based on what the room needs, and they’re typically mounted high on a room’s wall and are about the size of a long duffel bag. Some indoor units can also be mounted on the floor or recessed into a ceiling. The ceiling units are more discreet, but they require a much more invasive installation. The outdoor unit can be as small as a piece of luggage, but the more indoor units you have, the larger the outdoor unit needs to be to support them. “If you want to take care of more rooms in the future, you just leave a little extra capacity on the outdoor unit,” Smith said.

Mini-splits offer a lot of control, too, beyond their ability to be programmed like a regular thermostat. The best models can sense when someone is in the room (or not) and adjust the temperature accordingly, and then they can direct the air either away from you or toward you based on your preferences. Most models include a wireless remote and/or a wireless wall-mounted controller, and many can be controlled via smart phone or be integrated into a larger system like Nest or Alexa. We’ve tested a few standalone devices that act as thermostats for the individual rooms where the indoor units live.

Where mini-splits work well

A black mini-split unit on a living room wall.

Mini-splits can work as a small space’s primary system in a mild climate, but more often they’re ideal for rooms that don’t already have a heating and cooling system—like an addition, finished basement, attic bonus room, or a garage workshop. They can also add air conditioning to a high traffic area like a kitchen or living room, or even a room where you just might want a little extra temperature control like a nursery. For some homes, a couple of well-placed indoor units can handle the heating and cooling needs for most of the year.

Mini-splits also make sense in rooms that are off-kilter from the rest of the home’s heating system. De Stasio mentioned sunrooms, which are “pretty much glass ovens” that heat up and cool down much faster than the rest of the house. “The thermostat in the hallway 30 feet away has no idea that it’s 85 degrees in the sunroom.” A mini-split will allow you to condition that sunroom separately from the rest of the home.

For some homes, a couple of well-placed indoor units can handle the heating and cooling needs for most of the year.

Why not just get a window unit or portable AC?

All these advantages of a mini-split add up to increased comfort, especially when compared to the (much more affordable) options for treating single rooms: window air conditioners and portable ACs. For one, mini-splits are much quieter. With the system split between an indoor and outdoor unit, the only noise in the room is the fan needed to move air. There is none of the loud compressor hum that is typical of a window unit. In addition, most quality mini-split systems, much like the best whole-house systems, use variable-speed motors in their compressors. De Stasio explained, “On a mild day, a mini-split will actually run on a slower speed than on a hot day and save you energy, where a window unit will just come on and off on and off.” He added that this constant cycling of the window unit “consume[s] a massive amount of energy.” He explained: “Think of it like trying to push a car from a dead stop to 5 mph versus pushing it as it's already rolling forward. Which one requires more energy? The variable speed motors in a mini-split are never at a dead stop.”

Another downside to window units, De Stasio said, is that “every time that air conditioner shuts off and stays off for 20 minutes, you’re not doing any kind of dehumidification.” Since the mini-splits variable speed can dial down to near zero once the target temperature is reached, it’s actually at its most efficient when you leave it at the setting you find comfortable—win-win.

Beyond variable speed, a mini-split is comparably more efficient than a window unit due to its different construction. Mitsubishi Electric’s Smith explained that within the housing of the window AC are the same two components of a mini-split—the evaporator and a condenser. “Those two components of that system are separated by a very thin wall, and that thin wall is not doing a great job of keeping heat energy out.” With a mini-split, he said, the two components are “now separated by your insulated wall.”

The way a mini-split disperses air is better than a window unit or a portable AC. Smith explained, “When you’re trying to blow cool air into a hot room, the cool air will fall, so a window unit has a tougher time driving that cool air across the room because of the position of the window.” A mini-split is typically mounted high on a wall or even in a ceiling, giving it a much better throw of that cool air, with the ability to disperse it in a sweeping motion from side to side, up and down, or even directed towards a wall, if you want some circulation without a direct blast of air.

Last, a mini-split doesn’t occupy a room’s electrical outlet or affect the function of your windows. A window AC completely blocks a good chunk of the window, obviously. And even a portable AC hogs its share of the window space by requiring the window to stay shut tight against the vent hose hardware that every portable AC uses to dump heat outside.

Cons of a mini-split system

Mini-splits are never cheap. De Stasio told us a typical single-unit install costs roughly $3,000-$5,000, but if you’re looking to create a whole-house system—which needs multiple indoor units and a larger outdoor unit to support them—it can start getting cost-prohibitive. In 2017, a friend in Los Angeles installed a one-zone Mitsubishi Electric system with a single indoor unit for a total installed cost of about $4,500. In 2019, a friend in Hawaii installed a Mitsubishi Electric system with four indoor units (of three varying sizes) and a 42,000 btu, 5-zone outdoor unit to serve his entire house. The total cost came in just under $17,000. That’s a lot, but it may still come in under the cost of a comparable ducted system; on the other hand, the best window units and portables range from about $200 to $700 apiece.

You also have to commit to a location with the indoor units, and there’s no moving them around, like with window air conditioners or portable ACs. Ideally, the pipes go through the wall directly behind the unit, where they’re hidden. Depending on how the wall is constructed, this may cause the unit to be off-center on the wall, which you may not want. One mini-split owner we spoke to said that he wished he had understood this better. “In our bedroom, the unit is a little closer to the side wall than I'd like because they couldn't access the coupling without putting the unit where it is.” The other option in this situation is to have the pipes do a short run along the interior wall before going through it, but, as he said, “Generally, the units look best when the punch-through is hidden behind the unit rather than to the left or right of the unit.”

Even in the perfect location, mini-split indoor units take up a chunk of wall space and they’re not the most attractive things in the world, as we heard separately from two friends who recently installed them. It’s basically a boxy rectangle, or, as one owner put it, “a big stupid plastic giant lunchbox thing on your wall.” Some manufacturers offer a variety of colors, at least, and LG seems to be hearing these complaints with models like their Art Cool Mirror line. Another option is to get units that recess into the ceiling. But a ceiling installation will likely be more expensive and invasive.

Mini-splits can also struggle in extreme temperatures. According to Mitsubishi Electric, their best systems can operate at 100 percent capacity all the way down to an exterior temperature of about 23 degrees and will even operate at 75 percent at negative 13 degrees. Still, it’s something to consider when setting up a system for your home.

A related (more avoidable) downside is winding up with a system that feels undersized for your needs, even in less extreme weather, which happened to our LA friend. To play it safe, an installer might suggest going with a bigger outdoor unit, which has the flexibility to serve multiple indoor units. But the costs add up fast, and it can be tempting to try to get by with the minimum equipment possible. That may backfire if the system is underpowered. “I have to run the heat at 90 degrees for it to feel comfortable,” she says. “And then I have to run it all day.” On the bright side, she says, “the A/C works great.”

Last, mini-splits are nice in that they are all electric (and require no additional fuel or gas service, like with some traditional HVAC systems), but their electrical requirements are considerable. The 5-zone unit our Hawaii friend installed required a dedicated 40 A breaker for its 230-volt service, and his installation crew used a licensed electrical sub-contractor for the work, adding cost.

How we’d pick a brand

We found four leading brands in our research: Mitsubishi Electric, Fujitsu, LG, Daikin, and Panasonic (and a handful of smaller names, like Mirage). You probably don’t have a ton of choice on which exact pieces of equipment you need—that’s determined mostly by your home’s size, climate, and the heating and cooling needs you’re addressing. But you do have a choice to make on what brand you go with, and in a big market, you can take your pick among qualified installers recommended by each of those four manufacturers. We evaluated the options by looking broadly at the characteristics common to the brands as a whole—comparing things like warranty, aesthetic options, smart features, and other factors that would make a meaningful impact if we were shopping for ourselves. Here’s an overview by brand, in the order in which we would begin our search locally.

Mitsubishi Electric stands out in this field, for starters, by being among the most common and popular options available in North American markets. That translates to a larger pool of service technicians to choose from, better availability of more models, higher likelihood you’ll be able to design a system to fit your needs exactly, and potentially faster service for troubleshooting or repairs. They also have a reputation for durability. “I can count on one hand how many replacement parts I've had to put on a Mitsubishi mini-split system,” De Stasio said. “There are other brands where I can't say that.” If something does go wrong, Mitsubishi Electric’s limited 12-year parts warranty is among the best, and the brand’s popularity means lots of local utilities offer rebates. In Mitsubishi Electric’s brochure (PDF), you’ll find fairly limited aesthetic options for wall units, although matte silver and black wall unit finishes are available, and you can also consider ceiling mounts, floor mounts, or other special configurations. Mitsubishi Electric runs its smart features off a proprietary app, Kumo Cloud, which controls multiple zones via a clean-looking interface. The app seems to have picked up a lot of negative reviews initially (circa 2017), but usually works as expected according to several more recent reviews. We’ve just begun testing the app in summer 2019 and will update this guide with our notes.

LG is another big company that has advantages similar to Mitsubishi due to the company’s size, stability, and market saturation. You can find qualified LG installers in many metropolitan areas. Depending on the equipment involved, LG’s warranty can last up to 12 years, similar to Mitsubishi Electric’s, and LG’s local utility rebates vary by city, but they often cover at least some relevant mini-split equipment. LG’s catalog shows lots of aesthetic options on finishes for the wall units, and LG’s SmartThinQ app offers system-wide controls and reliable functionality. The app can potentially benefit some folks by also controlling other LG smart appliances at home, which would be convenient—and, to LG’s credit, after watching a lot of appliance makers’ apps have their ups and downs over the years, SmartThinQ’s roughly 3.5-star average across about 3,000 reviews is definitely above average for the category.

Daikin is another worldwide company that offers a large selection of units. They have a wide ranging network of installers and, like Mitsubishi and LG, a 12-year warranty for many of their products. The company offers many rebates as well as multiple control options.

Daikin and Fujitsu are fine alternatives to Mitsubishi Electric and LG. These may be lesser-known brands, but they both have wide-ranging networks of installers in most North American markets. The Fujitsu and Daikin warranties can last up to 12 years and both companies offer plenty of rebates. and local utilities offer rebates for lots of Fujitsu equipment, both in mini-split and conventional AC machinery. A minor reason we’d look to Mitsubishi Electric or LG first is that Daikin and Fujitsu offer relatively narrow choices on the look of the wall units, but fortunately, the various combinations of the system’s equipment still offer enough flexibility performance-wise to meet most homes’ needs. Daikin and Fujitsu offer similar smart-home functions to its competitors.

There are other manufacturers out there, but we can’t really imagine bypassing these four options for a niche brand with weaker availability, selection, and customer support.

How we’d pick an installer

Who you hire to install a mini-split system is as critical and difficult a decision as choosing the equipment itself. The machinery’s performance shouldn’t vary much, and defective units will be covered by warranty—but the commitment you make to an installer will determine how well the mini-split system functions in your space. A good HVAC firm will know what equipment to use—especially for tricky jobs that require some expertise and experience to design around—and the technical skill the pros bring to the installation will affect its initial performance as well as whatever service calls you make over the years. No pressure!

It is technically possible to install a mini-split yourself—how-to videos on This Old House look straightforward enough, and there’s a forum full of Reddit homeowners who say they’ve done it—but self-installation is probably not worth the risk. For one thing, even a perfect DIY installation may void the unit’s warranty, exposing thousands of dollars of equipment to the risk of not being covered on a legitimate claim. Beyond that, De Stasio told us, “There is so much that can go wrong if it’s not professionally installed. Your typical homeowner does not have the tools to do it or the instrumentation to take the measurements to know that it’s been done right.” Getting the right size unit is not as simple as calculating the area of a room, for example. “A 400 square foot room in New Hampshire requires a different amount of heating and air conditioning than a 400 square foot room in Florida.” A good HVAC installer will do a proper heat load calculation, which means, as explained by Todd Washam, director of industry and internal relations at The Air Conditioning Contractors of America, they “measure the windows, the tree overhangs for the shading, the pitch of your roof, the square footage, what type of floors, and the insulation in your attic and walls.”

There are companies, like Mr. Cool, that offer models that are marketed for DIY installation. These units are less expensive, but the installation process is not for the beginner, or even intermediate DIYer. It involves electrical work, plumbing, checking for refrigerant leaks, and drilling a 3½ -inch hole through the side of your house (and another one for the electrical line). This is not something that most people want to undertake just to save a couple thousand dollars. And after all of that, the warranty is shorter than the one provided by companies like Mitsubishi and LG. These DIY models are certainly an option, but not one to be taken on without carefully considering what you might be getting yourself into.

To give yourself a good chance at a satisfying mini-split installation, here’s how we’d approach the contractor hiring process for this job:

Ask locals who they used: If a mini-split makes good sense for your house, you’re probably not alone in your area. Start by asking homeowners in your community for recommendations for (or warnings against) local HVAC firms.

Seek mini-split experience: Seek some confirmation—photos of previous jobs, customer testimonials, Yelp reviews—that this crew has done a few mini-split installations before and their work has satisfied others. Equipment manufacturers can give you a bit of a head start: You can search for a qualified contractor in your area at the sites of Mitsubishi Electric, Fujitsu, Panasonic, LG, and other makers.

Set up a site visit and interview: For no charge, your prospective installer should come over, walk the property, talk about your needs, and discuss the equipment options available. Take notes on any models or sizes suggested, so you can do your own pricing research independently afterward. Ask detailed questions—could you potentially add another indoor unit in the future? Will this indoor unit adequately serve the entire space it’s meant for? Do they offer an ongoing service plan? Will the work be inspected? What kind of warranty does the contractor offer on the labor (independent of the manufacturer’s warranty)? Satisfy yourself that the installer understands the nuances of your space and the way the equipment can be configured to address your needs. This job requires engineering and design skills on top of technical know-how; your goal is to ensure you can get all of that.

Look for a personal connection: You’re getting into a relationship with this contractor. You’ll be in touch throughout the installation, and in the future for service calls, warranty claims, or other troubleshooting. Is this person reliable and responsive, or do you have apprehension about having them in and out of your house in the short term and in the future? Can you trust them?

Get three quotes: If there are multiple qualified installers in your area, call two or three of them. This is a multi-thousand-dollar job, but we’d advise this even for simpler work—it really gives you a clear sense of what the market for this work is like and often helps you weed out options you’re less comfortable with, giving you the confidence to commit to the best place available.

Request written estimates: At minimum, you should see a one-page quote outlining the work involved and the prices before you agree to start the job. Even better—detailed manufacturer’s information, from the pro, on each piece of equipment going into the job.

Weigh the options: If you’re deciding between some options—say, a 2-zone version of your system versus a 4-zone, ask for written estimates for both configurations. At the outset, when you’re asking lots of questions, be on the lookout for pushback, a dismissive attitude, or impatience—you should have questions, even some very basic ones, and it’s a good sign if a pro can answer them respectfully.

The outdoor element of a mini-split ac unit.

Specify equipment placement: Take pictures of the proposed locations of the installations, both on the indoor and outdoor units, to confirm their exact placement as part of your agreement. This is a final decision and can be a source of dissatisfaction among owners.

Make plans for maintenance: Mini-split maintenance is usually minimal but is also best done by an HVAC technician, at least until you watch them enough times to know the ins and outs yourself. It mostly consists of keeping the equipment clean and the drain line clear. De Stasio says, “At the end of the day, it’s a disinfectant cloth, it's a shop vac, it’s a water hose gently washing the outside coil. The tasks themselves are things that a homeowner can do, but a professional is going to know how to do them safely and how to do them thoroughly.”

What about smart controllers?

We tested three smart thermostat devices: the Ambi Climate 2, the Flair Puck, and the Sensibo Sky. At their most basic, they allow you to easily control your mini-split from your phone. Unlike manufacturer options such as Mitsubishi’s Kumo Cloud, which do the same thing, these 3rd party options do not require expensive professional installation. Though none of the three have so far lived up to our expectations, the Ambi and the Flair are much better than the Sensibo. We’re continuing to watch new releases and version upgrades and will test any that we think look good.

The Ambi Climate 2 is the most in-depth of the three. It attempts to monitor your home, AC use, and external temperatures then adjust your AC throughout the day. We like the set-it-and-forget-it use of it and how it adapted to our routine, but the app’s depth, amount of upfront information, and optional user settings makes it more complicated to use than others we tried. The controller units are not wall mounted but unobtrusive within most modern decor. Our experience with customer support was good but not great.

The Flair Puck is much simpler. The app is cleaner and much more straightforward, but it doesn’t try to do as much as the Ambi. It’s more like a modern replacement for the physical controllers that come with the mini-splits. It’s convenient, but it lacks some of the basic mini-split controls, like adjusting air direction, which the Ambi provides. The pucks can be wall mounted or stand alone and look like miniature Nest units though they aren’t as substantial. We like that you can also control the AC unit directly from the puck, which you can’t do with the Ambi. Flair’s customer service was excellent and very responsive. It’s also compatible with Ecobee sensors, Alexa, and Google Assistant.

Both the Ambi and Flair had issues with connectivity, especially with dual band WiFi. The signal strength of the units to the AC is hit or miss. When it works we were able to set them up over 25-feet away without an issue, but the best range seems to be closer to 12-feet. Good enough for a small room, but tougher in larger ones.

Another downside is that Flair and Ambi are not directly compatible with Apple’s HomeKit. Ambi does integrate with Siri shortcuts and has a 3rd party work-around for HomeKit, but it needs to be running 24/7 on your home computer in order for it to work.

The Sensibo Sky was our least favorite of the three. We found the overall design unappealing, the app was difficult to use, and the controllers were difficult to connect to our AC units. They also sent us a few oddly formatted and what can best be described as vaguely spam-y looking emails.

About your guides

Doug Mahoney

Doug Mahoney is a senior staff writer at Wirecutter covering home improvement. He spent 10 years in high-end construction as a carpenter, foreman, and supervisor. He lives in a very demanding 250-year-old farmhouse and spent four years gutting and rebuilding his previous home. He also raises sheep and has a dairy cow that he milks every morning.

Harry Sawyers

Harry Sawyers is the senior editor covering home improving, HVAC, and gardening at Wirecutter. He previously worked at This Old House and Popular Mechanics magazines; before that, he restored historic houses and mowed lawns for a living. He lives in a house in LA with his wife, three boys, a dog, and a lot of Wirecutter recommendations.

Further reading

  • The Best Air Conditioner
  • The Best Portable Air Conditioner
  • Cool Down With Chill Week

    Cool Down With Chill Week

    by Joshua Lyon

    It’s Chill Week here at Wirecutter, and we have plenty of tips and treats to help you cool down, from canned cocktails to a possible cure for night sweats.

  • How to Get the Most Out of Your Travel Reward Points

Ductless mr cool

I myself watched, cock suckers, ass fuck. Fuck his son to be smarter. I stood behind Lesha and slowly pushed a member into his anus.

MRCOOL performance test and cost to run - 18k DIY mini split

So happy Fedya meets her from the hospital, picks up Fedor Fedorovich, who looks like him like two drops of water, here they lie in bed, tired of sex and dream of a villa in Hawaii. A young man wake up, "someone gently touched the guy on the shoulder. - Fedya roused himself and rubbed his eyes, finding himself sitting in an empty auditorium.

Now discussing:

Breathing heavily, Luda put her head on my shoulder. I silently pressed on the seventh floor. With a tearing creak, the elevator continued its uneasy ascent.

82 83 84 85 86