75 ft 3/8″ x 5/8″ Mini Split Long Line Set – Extended HVAC Line Set with Insulated Copper Tubing

Premium 75 ft long line set with pre-insulated 3/8″ liquid and 5/8″ suction copper lines — ideal for extended-distance ductless AC and heat pump installations.

The Mini Split Long Line Set is twin already. So buy it now.

Product Overview – Extended Line Set for Long-Reach Mini Split Installations

The 75 ft 3/8″ x 5/8″ Mini Split Long Line Set is engineered for HVAC installations where extra distance is required between indoor and outdoor units. With factory-applied insulation and high-quality copper tubing, this long line set maintains thermal efficiency and system performance over long runs.

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Long 75 ft Length Supports Flexible Layouts

• Perfect for second-story installations, multi-room layouts, or rooftop units

• Allows smooth, continuous refrigerant lines without multiple couplings

• Reduces risk of leaks and improves overall system reliability

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Standard 3/8″ x 5/8″ Line Set Size

• 3/8″ liquid line for refrigerant feed

• 5/8″ suction line for return gas

• Fits a wide range of mini split and ductless air conditioner systems

High-Quality Insulated Copper Tubing

99.9% Pure Copper for Excellent Thermal Conductivity

Constructed from 99.9% pure copper, this long line set delivers outstanding heat transfer, corrosion resistance, and durability required for modern HVAC applications.

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Factory-Applied Insulation for Energy Efficiency

• Closed-cell insulation minimizes heat gain and loss over long distances

• Helps prevent condensation and moisture buildup

• Eliminates the need for field-wrapped insulation and saves installation time

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UV-Resistant Insulation for Outdoor Exposure

The insulation is UV-resistant and suited for both indoor and outdoor use, protecting the line set from sunlight and weather variations.

Compatibility & HVAC Applications

Designed for Mini Split & Ductless AC Systems

This 75 ft line set is widely used in:

• Mini split air conditioners

• Ductless heat pump systems

• Residential and light commercial HVAC installations

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Works with Modern Refrigerants

Compatible with common refrigerants including R410A, R32, and other HVAC refrigerants, meeting required pressure and safety standards.

Features of pipe insulation tubing:

Key Benefits of a 75 ft Mini Split Long Line Set

Fewer Couplings, Lower Leak Risk

A single continuous 75 ft line set eliminates the need for multiple couplings, reducing potential refrigerant leak points and maintenance issues.

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Cleaner Aesthetic and Professional Finish

A continuous long line set offers a neater installation compared to spliced lines — delivering a professional appearance and improved airflow.

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Preferred Choice for Large-Scale Installations

Ideal for large homes, multi-floor buildings, or installations requiring longer distance runs between indoor and outdoor units.

Technical Specifications

• Length: 75 ft (22.86 m)

• Line Sizes: 3/8″ (liquid line) × 5/8″ (suction line)

• Material: 99.9% pure copper tubing

• Insulation: Factory-applied, closed-cell, UV-resistant

• Application: Extended mini split, ductless AC and heat pump systems

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Installation Tips for Long Line Sets

Verify Manufacturer Maximum Line Length

Always check the mini split manufacturer’s specifications for maximum allowable line length to ensure optimal performance and warranty compliance.

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Maintain Proper Line Routing and Support

Plan routing paths to avoid sharp bends and secure the line set with appropriate brackets or clips to minimize vibration and strain.

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Protect Insulation at Wall Penetrations

Use protective grommets or sleeves at wall entry points to prevent insulation damage and ensure a tidy finish.

75 ft 3/8" x 5/8" Mini Split Long Line Set for HVACR Applications Wholesaler & Supplier

DABUND PIPE in-house tested insulate copper pipe and tubing is designed to make installation simple and quick – saving you time and money on each job.

Mini Split Line Set

Size	Length	Insulation White PE	Flame Resistant
1/4+3/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
1/4+1/2	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
1/4+5/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
3/8+5/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
3/8+3/4	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
1/2+3/4	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1
3/8+7/8	15m/20m/25m/30m/50m	8mm/9mm/10mm/13mm/19mm/25.4mm	M1/B1

1/4 + 3/8 AC line set used for 0.75TON - 1.0TON mini split air conditioner.

1/4 + 1/2 Mini split line set used for 1.5TON - 2.0TON mini split air conditioning.

1/4 + 5/8 Copper line set used for 2.0TON - 2.5TON split air conditioner system.

3/8 + 5/8 Insulated copper tube apply for 3.0TON - 4.0TON ductless mini split air conditioner.

3/8 + 3/4 Insulated copper tubing used for 4.5TON - 6.0TON split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 6.0TON - 8.0TON ductless mini split air conditioner.

Air conditioning copper line sets 1/4 + 3/8 used for 0.75P and 1P split air conditioning.

Copper pipe kit 1/4 + 1/2 commonly used for 1.5P and 2P mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 2P and 2.5air conditioner system.

3/8 + 5/8 Mini-split copper line set apply for 3P and 4P ductless mini split air conditioner.

3/8 + 3/4 Copper pipe kit used for 4.5P and 6P split aircon installation.

3/8 + 7/8 Insulated copper pipe apply for 6P - 8p TON ductless mini split air conditioner.

1/4 + 3/8 Mini split line set used for 9000BTU and 12000 BTU split air conditioner.

All copper line set 1/4 + 1/2 commonly used for 12000 BTU and 18000 BTU mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24000 BTU and 30000 BTU air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36000 BTU and 48000 ductless air conditioner.

3/8 + 3/4 HVAC lineset used for 54000 BTU and 72000 split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 72000 BTU - 96000 BTU ductless mini split air conditioner.

Aircon copper line set 1/4 + 3/8 used for 9K and 12K split air conditioner.

High quality copper line set 1/4 + 1/2 commonly used for 12K and 18K mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24K and 30K air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36K and 48K ductless air conditioner.

3/8 + 3/4 HVAC lineset used for 54K and 72K split air conditioner installation.

3/8 + 7/8 Insulated copper pipe apply for 72K - 96K ductless mini split air conditioner.

Why Choose This 75 ft Mini Split Long Line Set?

Built for Efficiency, Durability & Extended Reach Installations

With premium copper, durable insulation, and extended length, this long line set supports consistent HVAC performance and professional-grade installation over longer distances.

DABUND FACTORY

We produce Insulated Copper Pipe, Mini Split Line Set and Aluminum Pipe and HVAC Parts

SGS Certificate

Mini Split Line Set is made of Polypropylene or Black Rubber with UV Resistant, meets ASTM E 84, UL94, ASTM D1056 and ASTM G 21

Exhibition

We join the exhibitions all over the word, just to facilitate customers to experience our mini split line set face to face.

FAQ

1.Q:What is your payment terms?

A:TT,L/C AT SIGHT,CREDIT CARD etc

2.Q:What is your delivery terms?

A:EXW, FOB, CFR, CIF etc

3.Q:Are you trading company or manufacturer?

A:Manufacturer

4.Q:May I get a sample?

A:Yes, we can send you 3pieces free samples.

   You just charge for the express cost is ok.

5.Q:Can I print my logo?

A:Yes of cause, we accept OEM and ODM.

6.Q:How long is your delivery time?

A:Usually 15-20days, if urgent, we can arrange to do in advance and delivery fast.

7.What does 3/8″ x 5/8″ refer to?

It refers to the outer diameters of the refrigerant lines: 3/8″ for the liquid line and 5/8″ for the suction line, a common and versatile size used in many HVAC systems.

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8.When should I choose a 75 ft long line set?

Choose a 75 ft long line set when the distance between indoor and outdoor units exceeds standard lengths (25 ft, 35 ft, 50 ft), such as multi-story buildings or long horizontal runs.

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9.Does this long line set require extra insulation in the field?

No — the factory-applied insulation is sufficient for most indoor and outdoor applications. Additional field insulation is typically not needed unless required by local codes.

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10.Is this long line set compatible with modern refrigerants?

Yes — it is designed to work with common refrigerants such as R410A and R32, and supports high-pressure HVAC system requirements.