MRCOOL DIY Series: 3rd vs. 4th Generation

The newest generation of MRCOOL DIY mini split systems is here! MRCOOL 4th generation DIY mini splits add extra bonuses to the features you know and love from their 3rd GEN DIY systems. This includes impressive heating and cooling ranges, efficiency levels, and do-it-yourself installation! Their impressive new additions include:
  3rd Generation 4th Generation


Max. Zones Offered









Improved SEER Rating


  • 18K – 20 SEER
  • 24K – 20 SEER
  • 36K – 16 SEER
  • 18K – 22 SEER
  • 24K – 20.5 SEER
  • 36K – 18 SEER


DIY Pro Cable









  • 5-year limited parts warranty
  • 7-year compressor warranty
  • 1-year remote warranty for original registered owner
  • 5-year limited parts warranty
  • 7-year compressor warranty
  • Limited lifetime compressor warranty*

*Rules and restrictions may apply

Additional Zones

Depending on the unit, the 3rd generation offered multi-zone systems that could only support up to four zones. With MRCOOL’s new 48K BTU condenser, you can now heat or cool up to five zones! Keep up to five rooms in your home the perfect temperature all year round.

High SEER Ratings

The Seasonal Energy Efficiency Ratio measure the efficiency of an air conditioner. The higher the SEER rating, the more efficiently the unit operates. MRCOOL’s new 4th GEN DIY single zone offers increased SEER ratings over their 3rd generation counterparts.

BTU Unit        3rd Gen SEER Rating        4th Gen SEER Rating

18K                            20                                         22            

   24K                            20                                         20.5            

36K                            16                                         18            



MRCOOL’s 12K single zone unit boasts a 22 SEER rating. The 12K, 18K, and 24K units come with an Energy Star certification.

Best in Class Warranty

These new units include a 7-year compressor warranty and a standard 5-year parts warranty. For ultimate protection, you can sign up for a limited lifetime compressor warranty though rules and restrictions may apply*.


*Please read more about MRCOOL's warranty policy on the MRCOOL webpage.

DIY Pro Cable

Included with each mini split, the DIY Pro Cable features an interlocked aluminum armor PVC jacket which creates a durable design. It helps protect from garden equipment as well as damage from animals. The DIY Pro Cable also features flexible, easy connectors for a trouble-free installation.

How many rooms can they cool?

Their single-zone fourth generation units offer temperature control in rooms of various sizes, such as:

  • 12K BTU – manages 500 square feet
  • 18K BTU - manages 750 square feet
  • 24K BTU - manages 1,000 square feet
  • 36K BTU - manages 1,500 square feet

Their multi-zone units can control the temperature in up to 2, 3, 4, or 5 zones.

  • 18K BTU - up to 2 zones
  • 27K BTU - up to 3 zones
  • 36K BTU - up to 4 zones
  • 48K BTU - up to 5 zones

Another change they made is that the MrCool 4th generation does not offer as many complete systems as the 3rd generation. Instead, MrCool offers a configurator to help you choose the products you need. Just scroll about halfway down the page and select the button to begin configuring your system.

Check out the 4th generation of MRCOOL DIY mini split systems, including heat pump condensers, air handlers, and mini split systems at HomElectrical!

Avery Dietzen
Avery Dietzen

Originally from Wisconsin, Avery earned her degree in English before making the trip down to the Atlanta, GA area. Writer by day, reader by night, she prides herself on having a creative outlook and tries to instill that in everything she writes. As a content writer for HomElectrical, she uses her skills to share tips and tricks about lighting, HVAC, and going green. If she’s not writing, she’s reading, painting, hanging out with her dog, or spending time with family and friends.

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