MRCOOL DIY® 5th Gen 25 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set (for 24K & 36K Indoor Units)

MRCOOL DIY® 5th Gen 25 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set (for 24K & 36K Indoor Units)

The MRCOOL DIY® 5th Generation 25 ft. Pre-Charged Quick Connect Line Set is the standard-length refrigerant line set for MRCOOL’s 24K and 36K indoor units. Built for homeowners and HVAC professionals alike, this line set features 3/8" liquid and 5/8" suction lines, factory pre-charged with R-454B refrigerant, and sealed for leak-free performance.

Designed for easy installation with MRCOOL DIY 5th Gen single-zone and multi-zone systems, this 25 ft. line set comes equipped with Quick Connect fittings, making it possible to install without vacuum pumps, gauges, or licensed technicians.

Key Features

• Length: 25 feet – standard for most DIY mini split installations
• Line Sizes: 3/8" liquid x 5/8" suction – perfectly sized for 24K & 36K units
• Refrigerant: Pre-charged with eco-friendly R-454B
• Connection: Quick Connect fittings – no vacuuming, brazing, or special tools needed
• Durability: White UV-resistant insulation with robust copper line construction
• Compatible Systems:
  • MRCOOL DIY® 5th Gen Single-Zone 24K & 36K
  • MRCOOL Multi-Zone Systems: Multi3-18K, Multi4-27K, Multi5-36K, Multi6-48K, Multi6-55K
    (Line set must match the size of each air handler in multi-zone configurations)

Installation Tips

• This is the default line set length included with most 24K and 36K DIY systems.

• When extending beyond 25 feet, you'll need a coupler kit and longer control wire (Pro Cable) to complete the connection.

• Follow MRCOOL torque specs for fittings to ensure a proper seal and warranty compliance.

Shop with confidence at MRCOOL DIY Direct – the nation’s leading source for MRCOOL systems, accessories, and expert support. This 25 ft. line set is the perfect fit for standard installations and upgrades.