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

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

SKU: DIY50-1412C, DIY25-1412, DIYCOUPLER-1412K75C

Sale price$1,118.00 Regular price$1,499.00
Save 25%

Estimated delivery:
  • Secure Payment
    Amazon American Express Apple Pay Diners Club Discover Google Pay Mastercard PayPal Shop Pay Venmo Visa
    Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
  • Free Shipping*
  • 30-Day Return Policy⁺


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

This 75 ft. copper line set connects the 4th Generation MRCOOL Condenser to the MRCOOL Air Handlers - 9K, 12K and 18K BTU.

  • 75 ft. line set via a 50 ft. + 25 ft. + Coupler
  • Some assembly is required
  • This product includes:
    • MRCOOL DIY 4th Generation 50 Ft. 1/4" x 1/2" Lineset for DIY 9K, 12K, & 18K Indoor (DIY50-1412C)
    • MRCOOL 25 Ft. 1/4" x 1/2" Lineset for DIY 9K, 12K, & 18K Indoor (DIY25-1412)
    • MRCOOL DIY 4th Generation DIYCOUPLER-14 + DIYCOUPLER-12 + 75 Ft. MC-5 Cable (DIYCOUPLER-1412K75C)

For Multi-Zone systems, one line set per indoor unit is required to ensure the system will function properly.



Final Sale: MRCOOL Accessories are non-returnable. 

Contact a representative if you need assistance with finding the right HVAC Accessory.


    Model DIY50-1412, DIY25-1412, & DIYCOUPLER-1412K75C
    Line Set Connection Type Quick Connect
    Liquid Line Size 1/4 inch
    Suction Line Size 1/2 inch
    System Application Type Ductless Split Systems
    Warranty None
    Weight (lbs) 10.00
    California Residents See Prop 65 WARNING

      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 23 reviews
      WesD (Chicago, US)
      Installed and working great

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

      Thomas R. (Bradford, US)

      I had purchase a 2 zone/ 2 head unit.

      Installed to manufacture specs and instructions.

      One machine lasted 30 days before an internal fan motor- bearing broke and caused product failure.

      A week after that, the interior -second head unit failed. Completely iced up internally.

      I put a complaint in as soon as each issue presented itself.

      I have yet to receive compensation, a replacement part or acknowledgement of the second unit failing.

      I do not recommend Mr. Cool products to anyone. They are cheaply made and the customer support is extremely poor.

      Not worth DIY savings (pre charged units)

      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.

      Recently viewed

      You may also like