MRCOOL DIY 4th Gen Mini Split - 2-Zone 18,000 BTU Ductless Cassette Air Conditioner and Heat Pump with 9K + 9K Cassette Air Handlers, 50 ft. Line Sets, and Install Kit

MRCOOL DIY 4th Gen Mini Split - 2-Zone 18,000 BTU Ductless Cassette Air Conditioner and Heat Pump with 9K + 9K Cassette Air Handlers, 50 ft. Line Sets, and Install Kit


Sale price$4,752.00 Regular price$5,999.00
Save 21%

Line Set Mix: 50 ft. + 50 ft.
Air Handler BTUs

Estimated delivery:
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MRCOOL DIY 4th Gen Mini Split - 2-Zone 18,000 BTU Ductless Cassette Air Conditioner and Heat Pump with 9K + 9K Cassette Air Handlers, 50 ft. Line Sets, and Install Kit

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 18K BTU, 2-Zone, 21 SEER, Ductless Heat Pump Condenser (DIY-MULTI2-18HP230C)

  2. MRCOOL DIY 4th Gen 9K BTU, 20.75 SEER, Ductless Mini-Splits Ceiling Cassette Air Handler (DIYCASSETTE09HP-230C25) (x2) 

  3. Line Sets - length & quantity varies based on selection:
  • MRCOOL 16 Ft. 1/4-Inch x 1/2-Inch Lineset for DIY 9K, 12K & 18K Indoor (DIY16-1412)

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

  • MRCOOL DIY 4th Generation DIYCOUPLER-14 + DIYCOUPLER-12 + 75 Ft. MC-5 Cable (DIYCOUPLER-1412K75C)

MRCOOL 4th Gen Air Conditioner and Heat Pump Condenser

  • Power - 18K BTUs
  • Zones - Cool and heat up to two rooms in your home
  • SEER - SEER efficiency rating of up to 21
  • 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 - 9K 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 1/2-Inch x 6 Ft Metallic Electrical Whip with #10 Wire (6-12-6)DiversiTech 1/2-Inch x 6 Ft Metallic Electrical Whip with #10 Wire (6-12-6)
      DiversiTech Non-Fusible 60A Disconnect Switch (DDS-60U)DiversiTech Non-Fusible 60A Disconnect Switch (DDS-60U)
      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



      13.46" D x 26.5" H x 35.04" W


      208-230 V



      Cooling Capacity

      18K BTU

      Heating Capacity

      19K BTU

      Min-Max Ambient Cool

      5F ~ 122F

      Min-Max Ambient Heat

      -13F ~ 75.2F

      Refrigerant Type


      Max Line Set Length

      98.42 ft TOTAL


      9K Air Handler

      Product Dimensions

      13.19 in D x 8.98 in H x 50.31 in W


      208-230 V

      Cooling Capacity

      9K BTU

      Heating Capacity

      9K BTU


      • Quiet
      • Sleep
      • Auto Cool


      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





      Install Manual

      Owner Manual

      Remote Manual

      Technical Manual

      Warranty Doc

      Service Manual


      Air Handler


      Install Manual

      Remote Manual

      Warranty Doc

      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


      Customer Reviews

      Based on 26 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 !

      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

      Deborah B. (Memphis, TN)
      Heat pump unit

      My unit arrived on time and undamaged. It was installed without a problem. I hate the fuse unit didn't come with it. They did UPS it to me so I didn't have to put installation on hold. The unit is very quiet and works well.

      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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