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

Premium 100 ft long line set with pre-insulated 3/8″ liquid and 5/8″ suction copper tubing — engineered for extended-distance mini split, ductless AC, and heat pump installations.

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

Product Overview – HVAC Long Line Set for Extended Reach Installations

The 100 ft 3/8″ x 5/8″ Mini Split Long Line Set provides a continuous, factory-insulated copper refrigerant line solution for installations where extended reach is required between indoor and outdoor units. This long line set helps reduce couplings, improve efficiency, and deliver professional-grade HVAC performance.

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Extra-Long 100 ft Length for Flexible Layouts

• Ideal for large homes, multi-story buildings, roof-top units, and long horizontal runs

• Provides a continuous refrigerant path without the need for multiple splices

• Offers greater flexibility for challenging installations where standard line sets are insufficient

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Standard 3/8″ x 5/8″ Refrigerant Line Sizes

• 3/8″ liquid line for efficient refrigerant feed

• 5/8″ suction line for return gas flow

• Commonly used size pairing compatible with most modern mini split and ductless AC systems

High-Quality, Factory-Insulated Copper Tubing

99.9% Pure Copper for Optimal Heat Transfer

Constructed with 99.9% pure copper, this long line set delivers excellent thermal conductivity, corrosion resistance, and mechanical strength for reliable HVAC system operation.

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Factory-Applied Insulation for Thermal Efficiency

• Helps reduce heat gain and loss over long runs

• Prevents condensation and moisture buildup

• Eliminates the need for on-site insulation wrapping, saving installation time

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UV-Resistant Insulation Suitable for Outdoor Use

The insulation jacket is UV-resistant and weather-ready, making this line set suitable for both indoor and outdoor applications without additional protective layers.

Compatibility & HVAC Applications

Designed for Mini Split and Ductless AC Systems

This 100 ft long line set is widely used in:

• Mini split air conditioners

• Ductless heat pump systems

• Residential and light commercial HVAC setups

Works with Popular HVAC Refrigerants

Compatible with modern refrigerants such as R410A, R32, and other HVAC refrigerants, meeting system pressure and safety requirements for extended runs.

Features of pipe insulation tubing:

Key Benefits of a 100 ft Long Line Set

Fewer Couplings Reduce Leak Risks

A single 100 ft continuous line set minimizes the number of couplings required — lowering potential leak points and long-term maintenance issues.

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Professional Installation Appearance

Continuous, long-length line sets create a cleaner and more professional installation appearance compared to multiple shorter sets joined together.

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Supports Large-Scale or Complex HVAC Layouts

Ideal for installations with significant distance between indoor and outdoor units, such as multi-floor homes, large commercial spaces, or specialty layouts with long routing paths.

Technical Specifications

• Line Set Length: 100 ft (30.48 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: Mini split AC, ductless HVAC, heat pumps

Installation Tips for Long Line Sets

Verify Maximum Line Length per Manufacturer Guidelines

Always ensure the total line length complies with the mini split or HVAC manufacturer’s specifications to maintain efficiency and warranty coverage.

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Plan Routing to Avoid Tight Bends

Plan your line path to avoid excessive bends and sharp angles, ensuring smooth refrigerant flow and preventing insulation damage.

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Secure Lines with Proper Support

Use suitable clips or brackets to support long runs and minimize vibration, strain, or sagging along walls or structural surfaces.

100 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 100 ft Mini Split Long Line Set?

Engineered for Efficiency and Reliability in Extended HVAC Installations

With premium copper construction, factory insulation, and extended length, this line set supports efficient HVAC operation, lower installation complexity, and reliable system performance.

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″” mean in this long line set?

It refers to the outer diameters of the refrigerant pipes — 3/8″ for the liquid line and 5/8″ for the suction line, which is a common size used in many mini split and ductless AC systems.

8.When should I choose a 100 ft long line set?

A 100 ft long line set is best suited when the indoor and outdoor units are far apart, such as multi-story homes, rooftop installations, or layouts with significant horizontal runs.

9.Is additional insulation needed on site?

No — the factory-applied insulation is designed to handle most indoor and outdoor installation conditions. Additional field insulation is usually not required unless local codes specify otherwise.

10.Is this long line set compatible with R410A and R32 refrigerants?

Yes — this copper tubing and insulation system are compatible with common HVAC refrigerants such as R410A, R32, and other modern refrigerants, meeting pressure and safety requirements.