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How to Build Your Own MRCOOL DIY Multi-Zone Mini Split

Installing a MRCOOL DIY Mini Split can be a cost-effective way to control the temperature in up to five different zones of your home or business. To get started, you'll need to select the right components for your space. Here's how to configure your own MRCOOL DIY Mini Split for optimal results:

1. Determine the Number of Zones You Need to Control:

The first step is to decide how many separate zones/rooms will need climate control. Each area will need an air handler that will control the temperature in a specific zone, and you can choose between wall-mounted or concealed ceiling cassette models.

MRCOOL DIY Multi-Zone Concealed Ceiling Cassette

MRCOOL wall mounted and ceiling cassette air handlers come in the following five sizes:


a. 9k BTUs covers up to 375 sq. ft.

b. 12k BTUs covers up to 550 sq. ft.

c. 18k BTUs covers up to 800 sq. ft.

d. 24k BTUs covers up to 1,050 sq. ft. (wall mounted option only)

e. 36k BTUs covers up to 1,550 sq. ft. (wall mounted option only)

2. Choose the Right Condenser Size:

The size of the condenser will depend on the number of air handlers you plan to install. MRCOOL DIY Multi-Zone Mini Split offers the following four condenser sizes: 

MRCOOL DIY 4th Gen Multi-Zone Heat Pump Condenser

a. The 18k BTU 2-zone condenser connects 2 zones (2 connected air handlers are required for system to function)

b. The 27k BTU 3-zone condenser connects a minimum of 2 zones and maximum of 3 zones

c. The 36k BTU 4-zone condenser connects a minimum of 2 zones and a maximum of 4 zones

d. The 48k BTU 5-zone condenser connects a minimum of 2 zones and a maximum of 5 zones

3. Select the Right Line Set Length:

MRCOOL DIY Multi-Zone Line Set

You'll need to choose a line set length to connect each air handler to the condenser. The MRCOOL DIY Mini Split offers line set lengths of 16, 25, 35, and 50 feet. You can also connect line sets using a MRCOOL coupler kit to create up to 75 ft. of length maximum.

4. Consider Additional Accessories:

MrCool LineGuard 4.5" and Line Set Cover - 12 ft

Depending on your installation, you may need additional accessories like a line set cover to cover your line sets as they go up the sides of a house/building (cosmetic use) or condenser wall mount to ensure mount the condenser outside. If you live in an area that sees snow, it is recommended you mount the condenser at or above the average snow level for where you live.

5. Follow the Installation Instructions Carefully:

Be sure to follow the installation instructions closely to ensure proper installation and operation of your system.

6. Work with an Electrician for Installation:

While installing a MRCOOL DIY Mini Split system is relatively straightforward and does not require an HVAC technician, it's important to have an electrician check all connections to ensure safety and optimal performance.

Build Your Own MRCOOL Multi-Zone Mini Split HERE


By following these steps, you can configure your own MRCOOL DIY Multi-Zone Mini Split for easy climate control in your home or business.

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