MRCOOL DIY 4th Gen Multi-Zone 3-Zone 36,000 BTU 22 SEER (12K + 12K + 18K) Ductless Mini-Split Air Conditioner and Heat Pump

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44 reviews

Line Set for 12K Air Handler #1: 16 Ft
Line Set for 12K Air Handler #2: 16 Ft
Line Set for 18K Air Handler: 16 Ft
Sale price$4,594.00 Regular price$5,234.00
In stock


MRCOOL DIY 4th Gen Multi-Zone 36K BTU Three Zone Ductless Mini Split - A Heating and AC System You Can Install By Yourself!

Heat or cool three zones with the MRCOOL DIY Multi-Zone 36,000 BTU 22 SEER 3 Zone Ductless Heat Pump Split System - 12K + 12K + 18K. This DIY Series multi-zone product features easy installation that requires no special tools or training. You'll save thousands of dollars on installation and you can get the amazing air comfort of your dreams due to the condenser’s 36,000 BTU capacity. The indoor air handlers are two 12,000 btu (350 square feet) and one 18,000 btu (350 square feet). A heat pump by design, this ductless HVAC solution can run in reverse and pull in heat from the outdoors when in a heating mode. It comes with a 7 Year Compressor (Plus a limited lifetime compressor warranty), 5 Year Parts Manufacturer Warranty! 

MRCOOL DIY 4th Gen Multizone 36,000 BTU systems can support up to four indoor units. Not enough? The DIY MULTI 48,000 BTU system can support up to FIVE indoor units.

The MRCOOL DIY Multi-Zone 36K BTU 22 SEER 3 Zone Ductless Heat Pump Split System -12K + 12K + 18K units are super easy to install and require no special training or expensive specialty tools. The DIY system includes Quick Connect lines that are pre-charged with eco-friendly R-410A refrigerant. Due to the Quick Connect line set, you don’t have to hire an HVAC technician to complete the install. We also have simple video instructions on how to install a DIY Multi-Zone unit yourself!

The MRCOOL DIY Multi-Zone 36,000 BTU 22 SEER 3 Zone Ductless Heat Pump Split System - 12K + 12K + 18K can cool through the Summer, heat through the Winter, and dehumidify through the wet seasons. Plus, you can quickly check the temperature of each room in your home from the easy to read digital display or from the MRCOOL Smart Controller mobile app. The display on the front of each indoor air handler unit can also display troubleshooting codes and alerts, so you are always aware of any issues with your system. Operate each unit wirelessly with either the included remote or with the MRCOOL Smart Controller app for Apple or Android devices. You also have the ability to control your mini-split unit with Amazon Alexa or Google Home.

The three MRCOOL DIY Multi-Zone air handlers included in this set provide directional control of the heated or cooled air. This distributes the air evenly so everyone in the room can stay comfortable. If you are in a situation that requires forced cooling, you can set your MRCOOL DIY System to manual with the button located on the right side of the unit under the front panel. In this emergency operation mode, you can test the cooling operation of your unit after installation or to complete a maintenance task.

In auto mode, each unit provides air for your home at your desired comfort level. Set your desired temperature, and the HVAC unit will determine how much heat or air conditioning is needed. You can also set this system to a drying function, which will continue to control the space’s air temperature while dehumidifying.

Use the sleep mode at night to save money on your utilities bills and use less energy. Sleep mode operates in an 8 hour window once turned on.

The MRCOOL DIY Multi-Zone 36,000 BTU 22 SEER Three-Zone Ductless Heat Pump Split Air Conditioner System - 12K + 12K + 18K comes with many options, so you can customize your system based on your needs. Limit your energy usage and save money on your utility bill by using the system’s timer function. If your system begins to run low on refrigerant, an alert will appear on the easy-to-read display on the front of each air handler, letting you know there may be a leak. If you desire to keep a room quiet and minimize lighted alerts, you can mute each indoor unit. By muting the system, the buzzer for alerts will not sound and the LED lit display will turn off. Should the unfortunate event of a power outage occur, the MrCool system will automatically shut off and then back on with the same settings once power returns.

Easily maintain your MRCOOL DIY Multi-Zone 36,000 BTU 22 SEER Three-Zone Ductless Heat Pump Split Air Conditioner Unit with alerts and reminders. Any troubleshooting codes will appear on the front display and the user manual contains an index for common codes. Air filter cleaning alerts are automatic, and you can easily keep the minimal indoor units clean with a dry or damp cloth.


  • Easy DIY® Installation
  • "Pre-charged DIY®
  • Quick Connect Line Set"
  • Simple to Use
  • Multi-room Comfort
  • Energy Efficient DC Inverter
  • 100% Sealed System
  • Gold Fin® Condenser
  • Eco Safe R-410A Refrigerant
  • Smartphone App Controls
  • Lifetime Technical Support
  • Follow Me® Feature
  • Low Ambient Cooling

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Customer Reviews

Based on 44 reviews

App and controls could use some work.

Shaun Trivette

MRCOOL DIY 4th Gen Multi-Zone 3-Zone 36,000 BTU 22 SEER (12K + 12K + 18K) Ductless Mini-Split Air Conditioner and Heat Pump


Mostly good, it would be nice if it displayed current temp and not just set temp. Also, only able to turn heat down to 62, which is not good for when away from house. Need to have heat to prevent pipes from freezing but definitely do not need it to be hearing to 62.

Laura Meyers
Thanks for the help

Opting for this system for our vacation home was the right move. Chill Mini Splits made the purchase and delivery hassle-free.

Soren Martin
Thanks for answering my questions

It's been awesome! The DIY install was pretty easy too