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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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Line Sets

Line Sets

MRCOOL Line Sets

MRCOOL line sets carry refrigerant between the outdoor condenser and indoor equipment. The correct line set depends on the system series, refrigerant, connection type, tubing size, and required length. MRCOOL uses several different line-set platforms, so compatibility should always be verified against the exact equipment.

DIY Quick Connect Line Sets

MRCOOL DIY Line Sets are pre-charged Quick Connect line sets for compatible MRCOOL DIY equipment. Current DIY 5th Generation line sets use R-454B and are available in multiple tubing sizes based on indoor-unit capacity:

  • 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

Legacy DIY 4th Generation line sets use R-410A and are not interchangeable with current R-454B 5th Gen components. For current systems, see MRCOOL DIY 5th Gen.

No-Vac Quick Connect Line Sets

MRCOOL No-Vac Quick Connect Line Sets are pre-charged line sets used with compatible central-ducted MRCOOL equipment. Depending on the exact model and generation, they may be used with approved systems in the Hyper Heat, Universal, and VersaPro families.

Connection sizes and refrigerant requirements vary by model, so verify the exact equipment before choosing a No-Vac line set.

Flared Line Sets

MRCOOL Flared Line Sets are conventional copper line sets that are not pre-charged and do not use MRCOOL Quick Connect fittings. They are used with compatible professionally installed mini-split equipment, including approved Olympus and Advantage configurations.

Conventional flared systems require the refrigerant circuit to be installed, evacuated, leak-tested, and commissioned according to the equipment manual and applicable local requirements.

Line Set Accessories

For compatible Quick Connect systems, MRCOOL line-set couplers can be used for approved extensions. MRCOOL LineGuard covers help protect exposed refrigerant lines and create a cleaner finished installation.

Need Help Choosing?

If you are unsure which line set matches your equipment, contact our team with the condenser model, indoor-unit model, and required line-set length before ordering.

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