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Extra Savings on all  DIY Multi-Zone Mini Splits  — Add to Cart to See Your Price
Extra Savings on all  DIY Multi-Zone Mini Splits  — Add to Cart to See Your Price

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DIY Line Sets

DIY Line Sets

MRCOOL DIY Line Sets

MRCOOL DIY line sets are pre-charged refrigerant lines designed for compatible MRCOOL DIY systems. Current DIY 5th Generation line sets use R-454B refrigerant and MRCOOL Quick Connect fittings, helping simplify the refrigerant-side installation when installed according to the system manual.

DIY 5th Gen Compatibility

  • 1/4" x 3/8" — DIY 5th Gen 6K, 9K, and 12K indoor units
  • 1/4" x 1/2" — DIY 5th Gen 9K, 12K, and 18K indoor units
  • 3/8" x 5/8" — DIY 5th Gen 24K and 36K indoor units

Line sets are available in several lengths, including 16 ft., 25 ft., 35 ft., and 50 ft. Some versions include the DIYPro communication cable, while others are refrigerant-line-only products, so check the exact listing before ordering.

Current vs. Older DIY Line Sets

We currently offer a limited selection of DIY 4th Generation replacement line sets. Older 4th Gen systems use R-410A, while current DIY 5th Gen systems use R-454B. The line sets are not interchangeable between 4th and 5th generation systems. Match the line set to the exact system generation, tubing size, indoor-unit capacity, and model requirements.

Extending a DIY Line Set

Compatible MRCOOL Quick Connect couplers can be used for approved extensions. Do not cut or shorten a pre-charged DIY line set. If extra line-set length remains, follow MRCOOL installation guidance for routing the excess without kinking the copper tubing.

Shop MRCOOL DIY 5th Gen systems, browse MRCOOL line-set couplers, or contact MRCOOL HVAC Supply if you need help confirming compatibility.

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