Do I need an HVAC license to buy MRCOOL products?

No! MRCOOL DIY systems are designed for homeowners, contractors, and anyone handy with basic tools. You do not need a license to purchase or install most MRCOOL products.

Do you offer free shipping?

Yes. We offer free shipping to the lower 48 states on all full MRCOOL systems and most bundled packages. Smaller items may have calculated rates.

What makes MRCOOL DIY Direct different?

We are the USA’s most trusted independent MRCOOL dealer. We offer expert support, fast shipping, and exclusive early access to new generation systems and accessories.

MRCOOL DIY 4th Generation Line Sets for DIY Mini Splits

48 products

MRCOOL DIY® 5th Gen 50 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

Save 19%

MRCOOL DIY® 5th Gen 50 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

No reviews

Vendor:
NEW R-454B Refrigerant

Regular price $593.00 USD

Regular price ~~$728.99 USD~~ Sale price $593.00 USD
Unit price per

✅ In Stock
Shop Now

Save $135.99
MRCOOL DIY® 5th Gen 35 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

Save 19%

MRCOOL DIY® 5th Gen 35 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

No reviews

Vendor:
NEW R-454B Refrigerant

Regular price $502.00 USD

Regular price ~~$616.99 USD~~ Sale price $502.00 USD
Unit price per

✅ In Stock
Shop Now

Save $114.99
MRCOOL DIY® 5th Gen 25 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

Save 19%

MRCOOL DIY® 5th Gen 25 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

No reviews

Vendor:
NEW R-454B Refrigerant

Regular price $264.00 USD

Regular price ~~$324.99 USD~~ Sale price $264.00 USD
Unit price per

✅ In Stock
Shop Now

Save $60.99
MRCOOL DIY® 5th Gen 16 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

Save 19%

MRCOOL DIY® 5th Gen 16 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

No reviews

Vendor:
NEW R-454B Refrigerant

Regular price $227.00 USD

Regular price ~~$278.99 USD~~ Sale price $227.00 USD
Unit price per

✅ In Stock
Shop Now

Save $51.99
MRCOOL DIY® 5th Gen 16 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set (for 24K & 36K Indoor Units)

Save 19%

MRCOOL DIY® 5th Gen 16 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set (for 24K & 36K Indoor Units)

No reviews

Vendor:
NEW R-454B Refrigerant

Regular price $284.00 USD

Regular price ~~$348.99 USD~~ Sale price $284.00 USD
Unit price per

✅ In Stock
Shop Now

Save $64.99
MRCOOL DIY® 5th Gen 25 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set (for 24K & 36K Indoor Units)

Save 19%

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

2 reviews

Vendor:
NEW R-454B Refrigerant

Regular price $467.00 USD

Regular price ~~$573.99 USD~~ Sale price $467.00 USD
Unit price per

✅ In Stock
Shop Now

Save $106.99
MRCOOL DIY® 5th Gen 35 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

Save 19%

MRCOOL DIY® 5th Gen 35 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

No reviews

Vendor:
NEW R-454B Refrigerant

Regular price $582.00 USD

Regular price ~~$715.99 USD~~ Sale price $582.00 USD
Unit price per

✅ In Stock
Shop Now

Save $133.99
MRCOOL DIY® 5th Gen 50 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

Save 19%

MRCOOL DIY® 5th Gen 50 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

No reviews

Vendor:
NEW R-454B Refrigerant

Regular price $681.00 USD

Regular price ~~$837.99 USD~~ Sale price $681.00 USD
Unit price per

✅ In Stock
Shop Now

Save $156.99

Sort by:

48 products

Filter:

MRCOOL DIY® 5th Gen 50 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 50 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 35 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 35 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 25 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 25 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 16 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 16 ft. 1/4" x 3/8" Pre-Charged Quick Connect Line Set (for 6K - 9k - 12k Indoor Units)

MRCOOL DIY® 5th Gen 16 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set (for 24K & 36K Indoor Units)

MRCOOL DIY® 5th Gen 16 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)

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 35 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

MRCOOL DIY® 5th Gen 35 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

MRCOOL DIY® 5th Gen 50 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

MRCOOL DIY® 5th Gen 50 ft. 3/8" x 5/8" Pre-Charged Quick Connect Line Set with DIY Pro Cable (for 24K & 36K Indoor Units)

Sort by:

48 products

Filter and sort

Filter