MRCOOL DIY Lineset 25 ft | 3/8 in x 5/8 in for 24K and 36K Units

The 3/8 x 5/8 Line Set at Twenty Five Feet

Two line sets share this length and differ only in diameter, and choosing between them is the whole decision. This is the larger pair, 3/8 in and 5/8 in, which MrCool match to the 24K and 36K air handlers. The 1/4 by 1/2 set at the same 25 ft length belongs to the 9K, 12K and 18K units instead. Diameter follows the capacity of the handler, so the model plate decides it rather than the installer. Getting it wrong means fittings that will not mate and a system charge that was never intended for the volume. The set is pre-charged and factory sealed, and it is exclusively for MrCool DIY ductless systems rather than generic mini splits. A 3/4 in insulation sleeve covers both lines and is there for sun, weather and rodent protection. Quick connect valves keep the loop closed, so there is no vacuum pump and no brazing in the install. Two sets can be combined through a coupler kit where one is not enough. The refrigerant changed between MrCool DIY generations, so match the generation on your handler's model plate.

Budgeting Total Line Length Before Anything Is Cut

Total line length is a fixed budget on these systems and it is smaller than most people expect. MrCool support seventy five feet in total, counting the original set and any extension joined onto it. At twenty five feet this set uses a third of that, which leaves real headroom for a second length later. That is the practical argument for the middle sizes over the longest one. Measure the route rather than the room, and count the vertical rise as length because it is. Add slack at both ends for the service loop and for a handler that may be repositioned. Then leave the surplus out of the plan entirely, because coiled line outdoors is insulation ageing in the sun for no benefit. A joint is the other cost to weigh, since every coupler adds two more places a system can weep. One clean run beats two joined runs where the geometry allows it. Where it does not, the coupler kit exists and is supported inside the same cap.

Key Features

• Gauge: 3/8 in and 5/8 in, the larger MrCool pair
• For air handlers: 24K and 36K
• Not the same as: The 25 ft 1/4 by 1/2 set, which fits smaller units
• Length: Twenty five feet of run
• Charge: Pre-charged and factory sealed
• Exclusively for: MrCool DIY ductless systems
• Insulation: A 3/4 in sleeve against sun, weather and rodents
• Total run budget: Seventy five feet including any extension
• Joining: The matching coupler kit adds a second set
• Check first: The model plate on the handler, and the DIY generation

Technical Specifications