MRCOOL DIY 4th Gen Mini Split - 2-Zone 36,000 BTU Ductless Air Conditioner and Heat Pump with 18K + 18K Air Handlers, 50 ft. Line Sets, and Install Kit

MRCOOL DIY 4th Gen Mini Split - 2-Zone 36,000 BTU Ductless Air Conditioner and Heat Pump with 18K + 18K Air Handlers, 50 ft. Line Sets, and Install Kit


Sale price$4,581.00 Regular price$6,189.00
Save 26%

Line Set Mix: 50 ft. + 50 ft.

Estimated delivery:
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  • 30-Day Return Policy⁺


MRCOOL DIY 4th Gen Mini Split Bundle

The MRCOOL 4th Gen Mini Split bundle includes everything you need to heat and cool up to two rooms. The easy installation, Do-It-Yourself

Bundle Includes:

  1. MRCOOL DIY 4th Gen Multi-Zone 4-Zone 36K BTU Condenser Up to 21.5 SEER (DIY-MULTI4-36HP230C)

  2. MRCOOL DIY 4th Generation 18K BTU Heat Pump Wall Mount Air Handler with 25ft DIY Pro Cable and Enhanced WiFi - WorKs with Alexa & Google Assistant (DIY-18-HP-WMAH-230C25) (x2) 

  3. Line Sets - length & quantity varies based on selection: 

  • MRCOOL DIY 4th Generation 50 Ft. 1/4" x 1/2" Line Set for DIY 9K, 12K, & 18K Indoor (DIY50-1412C)

  • MRCOOL DIY 4th Generation 66 Ft. 1/4" x 1/2" Line Set for DIY 9K, 12K, & 18K Indoor (DIY66-1412C)

  • MRCOOL DIY 4th Generation 75 Ft. 1/4" x 1/2" Line Set for DIY 9K, 12K, & 18K Indoor (DIY75-1412C)

MRCOOL 4th Gen Air Conditioner and Heat Pump Condenser

  • Power - 36K BTUs
  • Zones - Cool and heat up to four rooms in your home
  • SEER - SEER efficiency rating of up to 21.5
  • Durable - Constructed to hold up against the weather and resist corrosion with its durable Gold Fin Condenser coating. Performs in weather conditions down to 5°F
  • Easy DIY Installation - Easy to install and no technician required. Includes everything to easily Do-It-Yourself
  • Environmentally Friendly - R-410A environmentally friendly refrigerant
  • Warranty - Standard 7-year compressor/5-year parts warranty; register for limited lifetime compressor warranty

    MRCOOL Wall Mount Air Handler - 18K BTU - Quantity 2

    • Modes - Choose from COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP.
    • Smartphone Control - Control with your Apple or Android smartphone through the use of the Smart HVAC app
    • Easy DIY Installation - With its light and compact design, it can be installed easily on most interior walls with the included mounting plate

      MRCOOL Line Sets

      • The MRCOOL copper line set is required to connect the Condenser to each Air Handler.
      • Environmentally Friendly - Line sets come pre-charged with R-410A refrigerant, the safest form of refrigerant.
      • Length Options - Select which combination of lengths you require for your installation needs.
      • Need more length? Use a coupler to connect two lines together


      DiversiTech 3/4 Inch x 6 Ft Metallic Electrical Whip with #8 Wire (6-34-6)DiversiTech 3/4 Inch x 6 Ft Metallic Electrical Whip with #8 Wire (6-34-6)
      DiversiTech Non-Fusible 60A Disconnect Switch (DDS-60U)DiversiTech Non-Fusible 60A Disconnect Switch (DDS-60U)
      MRCOOL Condenser Wall Mounting Kit for 24K & 36K BTU Ductless Split Systems (MB440A)MRCOOL Condenser Wall Mounting Kit for 24K & 36K BTU Ductless Split Systems (MB440A)
      MRCOOL Smart HVAC Mini Stat in White (MTSK02)MRCOOL Smart HVAC Mini Stat in White (MTSK02)
      MRCOOL MRCOOL Smart HVAC Mini Stat in White (MTSK02)
      Sale price$98.00 Regular price$149.00



      16.14" D x 31.89" H x 37.24" W 


      208-230 V



      Cooling Capacity

      36K BTU

      Heating Capacity

      36K BTU

      Min-Max Ambient Cool

      5F ~ 122F

      Min-Max Ambient Heat

      -13F ~ 75.2F

      Refrigerant Type


      Max Line Set Length

      196.85 ft TOTAL


      18K Air Handler

      Product Dimensions

      8.90" D x 13.19" H x 42.52" W 


      208-230 V

      Cooling Capacity

      18K BTU

      Heating Capacity

      18K BTU


      • Auto - auto selects from Cool, Heat or Fan-Only
      • Dry (Dehumidifies)
      • Cool
      • Heat
      • Fan Only
      • Quiet
      • Sleep


      Line Sets


      16 ft., 25 ft., 35 ft., or 50 ft.

      Liquid Line Size


      Suction Line Size



      • Connect 50 ft. line set to 16 ft. or 25 ft. line set
      • For 24K or 36K Air Handler: DIYCOUPLER-3858K75C
      • For 9K, 12K, or 18K Air Handler: DIYCOUPLER-1412K75C

      Restricted States



      Proposition 65 Warning



      Mini Split FAQ

      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.)*
      9K BTU
      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


      Email Quote

      Customer Reviews

      Based on 27 reviews
      Peter K. (Phoenix, AZ)
      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, IL)
      Installed and working great

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

      Scott S. (Saint Paul, MN)
      Excellent price, great service

      No muss, no fuss. 1 call about extended warranty which I declined. Otherwise just straight forward drop shipment to curb, on time and as expected. All items in perfect shape, no breaks or rips in boxes.
      The items (Mr. Cool 27k 3 head 9k/9k/12k DIY) installed great, easy to follow instructions. 1 wall insert was slightly cracked due to no packing material in the line box, but I it taped up and it inserted fine. Could have used more custom sized lines for fitting but otherwise very happy with product.

      Ian N. (Los Angeles, CA)
      Easy to install. Works great

      Needed a 2-zone for my garage and room we built above the garage. I originally thought I would have to buy 2 separate mini splits, but the HOD rep explained I could get a multi zone set up.
      I got the mrcool 2-zone. Was easy to to install. Works great at both cooling and heating.
      I recommend Home Outlet Direct to all my friends, thank you for the help.

      Chris W. (Miami, FL)
      Love my new mini split

      Ordered a MRCOOL mini split from Home Outlet Direct. I purchased a 3 zone set up, so it could cool 3 rooms in my home. All items arrived quickly. Easy to install as well and working great. Overall I had a great experience and would recommend Home Outlet Direct

      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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