Mr Cool DIY Mini Split Reviews and Buying Guide 2021

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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.

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

MRCOOL DIY-18-HP-230B25

#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

MRCOOL-DIY-12-HP-115B25

#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

MRCOOL-DIY-24-HP-230B25

#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

#5 MRCOOL DIYM227HPW04B

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

Best Dual Zone

MRCOOL – DIYM32HPW01B

#6 MRCOOL DIYM327HPW01B

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

Best Triple Zone

MRCOOL – DIYM436HPW02B

#7 MRCOOL DIYM436HPW02B

  • 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.

MRCOOL DIY-18-HP-230B25

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.

Features:

  • 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
  • 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.

MRCOOL-DIY-12-HP-115B25

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.

Features:

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

MRCOOL-DIY-24-HP-230B25

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.

Features:

  • 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
  • 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.

Features:

  • 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
  • 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

#5 MRCOOL DIYM227HPW04B

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.

Features:

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

#6 MRCOOL DIYM327HPW01B

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

MRCOOL – DIYM32HPW01B

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.

Features:

  • 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
  • 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

#7 MRCOOL DIYM436HPW02B

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

MRCOOL – DIYM436HPW02B

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.

Features:

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

12000

500 – 650

Single Zone

18000

650 – 1000

Single Zone

24000

1000 – 1350

Single Zone

27000

1100 – 1500

Dual or Tri Zone

36000

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.
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