MRCOOL DIY 4th Gen 36K BTU, 18 SEER, Ductless Mini-Split Wall Mounted Air Handler (DIY-36-HP-WMAH-230C25)

MRCOOL DIY 4th Gen 36K BTU, 18 SEER, Ductless Mini-Split Wall Mounted Air Handler (DIY-36-HP-WMAH-230C25)

SKU: DIY-36-HP-WMAH-230C25

Sale price$1,188.00 Regular price$1,699.00
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MRCOOL DIY 4th Gen 36K BTU, 18 SEER, Ductless Mini-Split Wall Mounted Air Handler (DIY-36-HP-WMAH-230C25)

This product only includes an Air Handler. Click here for our complete Mini Split systems.

MrCool DIY 4th Gen 36k BTU Ductless Mini-Split Air Handler 208-230V/60Hz


The MrCool 4th Generation DIY 36K BTU Ductless Wall Mounted Air Handler is the highest capacity air handler in the DIY series and has the ability to cover an area up to 1,500 sq. ft. Even with that level of performance, it can still deliver an impressive 18 SEER efficiency rating when connected to a MrCool Condenser. It also features multiple operating modes which include HEAT, COOL, AUTO, DRY (dehumidify), and SLEEP.

To take the functionality even further, this unit can also be operated by your Apple or Android smartphone with use of our convenient Smart HVAC app. This air handler has a compact design which makes it easier to mount to most interior walls when using the included mounting plate.

This air handler is also designed to be installed using MrCool's patented Pre-Charged Quick Connect Line Set. The quick connectors allow the line set to be installed in a few simple steps with two wrenches. It comes precharged with R-410A refrigerant, so no vacuuming or charging of the system is required once installed.

Let the MrCool 4th Generation DIY 36K BTU Ductless Wall Mounted Air Handler take care of the heating and cooling of your home.



  • SmartHVAC app: WIFI control - control your DIY anywhere with your Apple or Android smart device and an Internet connection
  • Standard 7-year compressor/5-year parts warranty; register for limited lifetime compressor warranty
  • Compatible with Amazon Alexa and Google Assistant
  • Includes the new DIY Pro Cable, an added safety feature to protect the wiring from the outside elements


11.10" D x 14.25" H x 49.57" W 

Cooling Capacity

36000 BTU

Heating Capacity

36000 BTU


208-230 V




60 Hz

Mount Type




Color Family


Max Coverage Area

Up to 1500 sqft

Refrigerant Type


 Decibel Rating


Decibel Rating Low

34 dBA

Decibel Rating High

52 dBA



Max Lineset Length

213.25 ft

Liquid Line Size

3/8 in

Suction Line Size

5/8 in

Blower Motor Rpm


Fan Only Option


Quiet Mode


Auto Cool


Wi-Fi Compatibility


App Compatibility


Works With iOS


Works With Android


Remote Control Included


Energy Star Certified


AHRI Certified


Registered Warranty

Limited Lifetime Compressor

Base Warranty

5-year Parts/7-year Compressor

Base Parts Warranty

5-year Parts

Registered Compressor Warranty

Limited Lifetime Compressor

Base Compressor Warranty

7-year Compressor

Has Batteries


Contains Electronics


Contains Chemicals


Contains Aerosol


Contains Compressed Gas


Proposition 65 Warning


Restricted States


Net Weight

47.84 lbs

Gross Depth

21.26 in

Gross Height

19.09 in

Gross Width

56.69 in

Gross Weight

78.26 lbs

What BTU rating should I choose for my air handler?

  • This depends on the coverage area/room size you are trying to heat/cool
  • An Air Handler's BTU is how powerful the fan is. A higher BTU rating will be able to heat/cool a larger area
Air Handler BTU Coverage Area/Room Size (Sq Ft.)*
Up to 375 Sq. ft
12K BTU Up to 500 Sq. ft
18K BTU Up to 750 Sq. ft
24k BTU Up to 1000 Sq. ft
36k BTU  Up to 1500 Sq. ft

*Ceiling height, insulation, and local climate may impact the coverage area. For example, an uninsulated room will require more power than a well insulated room.

Shipping & Returns

*Shipping Policy

  • Shipping is Free
  • Large appliances ship via Freight Curbside shipment. Meaning the carrier will drop off your item on your property not inside your home. The courier company will call ahead of time to schedule a drop off date
  • For the full details, visit our Shipping Page

Return/Refund Policy
  • 30-Day Return Policy
  • If your order arrives damaged, we will exchange you for a new one. Damage must be reported within 24 hours. 
  • For more details, visit our Return Policy Page


Customer Reviews

Based on 23 reviews
Peter K. (Phoenix, US)
Pretty Easy Install and Works Great!

Installed my own central HP system. It was a bit of work but nothing beyond a person with basic mechanical and electrical skills. It took me a while because I had to remove the existing electric forced air furnace from a pretty tight place. Some custom sheet metal work and a bit of custom electrical too. Worked perfectly when powered up and I actually like the thermostat provided, although I wish it was clearer how to set up a temperature set-back schedule. Pre-charged refrigerant piping was something new and I liked that too. The best thing is that my electric utility forked out $4,000 and that paid for the unit!

WesD (Chicago, US)
Installed and working great

Installed with ceiling cassettes... Quiet and keeping us cool so far !

Nat R. (Odessa, US)
4 ton condensing unit

Very good delivery service installed and works like a Should

walter w. (Port Neches, US)
Old r22 unit, same capacity, worked better in temperature extremes

Product came packaged well, undamaged. Installation was difficult, followed instructions for suction line above coil on bilevel installation with coil above condenser. 108 inside house on startup, 103 ambient. First start, high pressure 500, low pressure 170, supply air temp 66 degrees. Very worried at first, but after house cooed down, everything within parameters. Researched 410a refrigerant, found out it looses efficiency exponentially during temperature extremes. My old r22 unit would supply 54 degree supply air in comparable operating conditions. EPA, government, a/c manufactures all lying to American public

justin N. (New York, US)
Well built

First time ever installing Mr cool unit was built very good it has a dc converted fan motor,came with a salt shelf type coating om inside of unit over all very impressed 5star system

Why buy a MRCOOL from Home Outlet Direct?

- We are an authorized MRCOOL dealer

- Industry leading sales and customer service

- Thousands of happy customers

Real Customers. Real Results.

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