Ductless Mini Split Copper Lines & Kits

Get dependable connections with our selection of ductless mini split copper line sets and line kits designed for clean, efficient installs.

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Ductless Mini Split Copper Lines & Kits

Ductless line sets are refrigeration-grade copper pairs with factory flares, insulation and accessories that connect your indoor and outdoor units. Choose popular sizes like 1/4 x 3/8 or 1/4 x 1/2 and common lengths to fit new installs, replacements, or relocations. Options help DIY-savvy homeowners, licensed contractors, property managers, and light commercial users get reliable results on a budget.

Use these sets for connecting mini split heads to condensers, running new refrigerant lines during remodels, or replacing aging tubing. Typical project lengths range from 15-50 feet; order the shortest practical run to reduce pressure drop and improve performance. Our value-packed selection starts around $125 and tops out near $458 to keep costs predictable.

Specs to know: system efficiency numbers like SEER2 and HSPF2 apply to equipment, not the line set. Size the tubing to the system’s BTU/tonnage per the manufacturer-many 9k-12k systems use 1/4 x 3/8, while 18k-24k often call for 1/4 x 1/2. These copper sets are commonly compatible with modern refrigerants such as R-410A and R-32; always verify requirements for your exact unit.

Top Brands for Ductless Mini Split Copper Lines & Kits

Shop proven value from Copper for consistent quality copper, clean flares, and durable insulation suited to residential and light commercial installs.

Frequently Asked Questions

  • What size copper line set do I need for my ductless mini split?

    Match the liquid and suction sizes to your unit’s specifications. As a common guide, 9k-12k use 1/4 x 3/8 and 18k-24k often use 1/4 x 1/2. Always follow the manufacturer.

  • Are these line sets pre-flared and ready for installation?

    Most mini split line sets are sold pre-flared with flare nuts and insulation. Confirm product details and always torque to spec, pressure test, and evacuate before opening valves.

  • What refrigerants are these copper line sets compatible with?

    They are typically suitable for modern refrigerants like R-410A and R-32. Check your system manual to confirm refrigerant and oil compatibility.

  • How do I choose the correct line set length for my installation?

    Measure the route with gentle bends, add a small allowance for service loops, and keep within the unit’s minimum/maximum length and elevation limits.

  • Can I install a mini split line set myself?

    Running and routing the tubing can be DIY-friendly, but refrigerant work (pressure testing, evacuation, opening valves) should be done by a licensed HVAC professional.

  • Do I need additional insulation or accessories when running lines through walls?

    Use wall sleeves, sealant or putty, UV-rated wrap, line set covers, and proper supports. Local code may require sleeving and air sealing.

  • Are line set extensions or couplers recommended for longer runs?

    A single continuous set is best. If a joint is unavoidable, use approved flare unions or brazed connections installed by a pro and adjust charge as required.

  • What is the difference between 1/4 x 3/8 vs 1/4 x 1/2 line sets?

    The suction line is larger on 1/4 x 1/2 to support higher capacities and reduce pressure drop. Use the size specified by your equipment.

  • Do kits include communication wire or a drain hose?

    Contents vary. Some sets are copper and insulation only. Communication cable, drain line, and covers are often purchased separately.

  • How do I protect line sets outdoors?

    Install line set covers, secure with clamps, avoid sharp bends, and shield insulation from UV and physical damage for long-term performance.

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