25 ft 3/8" x 5/8" Insulated Copper Pipe for Mini Split and HVAC Systems

The 25 ft 3/8" x 5/8" insulated copper pipe is designed for professional HVAC and refrigeration installations. This pre-insulated copper line set connects the indoor evaporator unit to the outdoor condenser unit, allowing refrigerant to circulate efficiently within the air conditioning system.

Manufactured with 99.9% pure copper tubing, this HVAC line set provides excellent thermal conductivity, corrosion resistance, and long-term durability. The copper pipe meets ASTM B280 and C12200 standards, ensuring reliable performance in modern HVAC refrigeration systems.

The 25-foot length makes it ideal for residential air conditioning installations while reducing the number of pipe connections and potential refrigerant leaks.

The Mini Split Installation Kit is twin already. So buy it now.

Key Specifications of the 3/8" x 5/8" Insulated Copper Line Set

This insulated copper pipe is manufactured according to international HVAC standards and is suitable for a wide range of air conditioning applications.

Product Specifications

• Pipe Size: 3/8" + 5/8" (9.52 mm + 15.88 mm)

• Length: 25 ft (7.6 m)

• Copper Purity: 99.9% Pure Copper

• Insulation Material: Closed-cell polyethylene foam or rubber insulation

• Temperature Range: -40°C to 120°C

• Copper Standard: ASTM B280 / C12200

• Insulation Certifications: ASTM E84, UL94, ASTM D1056, ASTM G21

These specifications ensure the line set delivers reliable refrigerant flow and long-term durability in HVAC systems.

High-Purity Copper Tubing for Efficient Refrigerant Flow

The copper tubing used in this insulated line set is made from high-purity copper, which provides superior thermal conductivity and mechanical strength.

Benefits of copper HVAC tubing include:

• Excellent heat transfer efficiency

• Strong resistance to corrosion and oxidation

• High pressure tolerance for modern refrigerants such as R410A

• Long service life in HVAC refrigeration systems

Because of these advantages, copper remains the industry standard for air conditioning refrigerant piping worldwide.

Three-Layer Insulation Structure for Maximum Protection

The insulated copper pipe features a three-layer insulation structure that enhances thermal performance and durability.

Outer Layer
Embossed UV-resistant polyethylene film protects the pipe from sunlight, aging, and mechanical wear.

Middle Layer
High-density IXPE foam insulation provides excellent heat and cold resistance while absorbing external impacts.

Inner Layer
Closed-cell insulation structure prevents moisture penetration and maintains stable temperature performance.

This design improves HVAC system efficiency while protecting the refrigerant pipe from environmental damage.

High-Performance Insulation for Energy Efficiency

The copper tubing is covered with high-quality insulation designed to maintain stable refrigerant temperatures and reduce energy loss.

Key insulation benefits include:

• Prevents condensation formation

• Improves HVAC energy efficiency

• Provides UV and weather resistance

• Protects copper pipes from moisture and corrosion

The insulation materials meet international fire and safety standards including ASTM E84 and UL94 flame resistance tests.

99.9% Pure Copper

White PE Insulated Pipe

Copper Nut

Features of pipe insulation tubing:

Machines for the production of thermal insulation pipes

warehouse for insulation pipes

Inner Layer Insulated Pipe

Flexible Copper Coil Design for Easy HVAC Installation

The 25 ft insulated copper coil allows HVAC technicians to easily route the refrigerant lines through walls, ceilings, and floors.

Advantages include:

• Easy cutting to required installation length

• Reduced number of connectors and joints

• Faster installation process

• Lower risk of refrigerant leakage

This flexibility makes the copper line set ideal for residential and light commercial HVAC projects.

Applications for Mini Split and Air Conditioning Systems

The 3/8" + 5/8" insulated copper line set is widely used in HVAC refrigeration systems, including:

• Ductless mini split air conditioners

• Heat pump systems

• VRF / VRV air conditioning systems

• Residential central air conditioning installations

• Commercial cooling systems

This pipe size is commonly used for 3 ton to 4 ton air conditioning systems (36,000–48,000 BTU).

Multiple Insulation Options for Different HVAC Environments

To meet different installation environments, the insulated copper pipe is available with multiple insulation materials and thickness options.

Available insulation options include:

White PE Insulation

• Thickness options: 8 mm, 9 mm, 10 mm, 13 mm, 19 mm, 25.4 mm

Black Rubber Insulation

• Thickness options: 13 mm, 17 mm, 19 mm, 25.4 mm

These options allow HVAC installers to choose the appropriate insulation depending on climate conditions and installation requirements.

Custom HVAC Copper Line Sets Available

Professional HVAC manufacturers offer customization options to meet various installation requirements.

Available customization options include:

• Custom copper pipe sizes

• Different insulation thickness options

• Custom pipe lengths

• OEM logo printing on insulation

• Private label packaging

These services help HVAC distributors and contractors build their own product brands.

Insulated Copepr Pipe

1/4 + 3/8 Mini split installation kit 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 Mini Split Installation Kit 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.

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 Mini split installation kit used for 54000 BTU and 72000 split air conditioner installation.

3/8 + 7/8 Mini Split Installation Kit 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.

Mini Split Installation Kit 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 Insulated copper pipe used for 54K and 72K split air conditioner installation.

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

Why Choose DABUND Insulated Copper Pipe

DABUND is a professional manufacturer of HVAC copper line sets with extensive production and export experience.

Key advantages include:

• Over 14 years of HVAC manufacturing experience

• Two production factories with large capacity

• Monthly production capacity of 1,000,000 pieces

• Strict quality inspection and testing

• Competitive factory pricing

The company supplies insulated copper pipes, mini split line sets, and HVAC installation accessories to global distributors and contractors.

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.What is a 3/8" x 5/8" insulated copper pipe used for in HVAC systems?

A 3/8" x 5/8" insulated copper pipe is primarily used as a refrigerant line set in mini split air conditioners, heat pumps, and other HVAC refrigeration systems. The copper tubing connects the indoor evaporator unit and the outdoor condenser unit, allowing refrigerant to circulate between the two components. The insulation layer helps maintain refrigerant temperature, reduce energy loss, and prevent condensation on the pipe surface.

2.Why are insulated copper pipes important for mini split air conditioners?

Insulated copper pipes play a critical role in the performance of mini split HVAC systems. The insulation prevents heat transfer between the refrigerant and the surrounding air, helping the system maintain efficient cooling performance. It also prevents condensation, which protects walls and building structures from moisture damage.

3.What size HVAC systems typically use a 3/8" x 5/8" copper line set?

A 3/8" liquid line and 5/8" suction line is commonly used for medium to large mini split or central air conditioning systems, usually ranging from 36,000 BTU to 48,000 BTU (3–4 tons). However, HVAC installers should always verify the required pipe size according to the equipment manufacturer's specifications.

4.Can a 25 ft insulated copper line set be cut during installation?

Yes. A 25 ft insulated copper pipe can easily be cut to the required length during HVAC installation. Professional HVAC technicians typically trim the pipe based on the distance between the indoor and outdoor units. Cutting the pipe to the correct length helps reduce unnecessary bends and minimizes the risk of refrigerant leakage.

5.What type of insulation is used on HVAC copper pipes?

Most HVAC insulated copper pipes use closed-cell polyethylene (PE) foam or rubber insulation. This type of insulation provides excellent thermal resistance, prevents condensation, and protects the copper tubing from UV exposure and moisture. High-quality insulation also improves the overall energy efficiency of the air conditioning system.

6.How long do insulated copper pipes last in HVAC systems?

High-quality insulated copper HVAC pipes can last 20 years or more when properly installed and maintained. Copper is naturally resistant to corrosion and can withstand high refrigerant pressures. When combined with durable insulation, the pipe remains protected from environmental damage for many years.

7.Are insulated copper pipes compatible with modern refrigerants?

Yes. Copper pipes manufactured according to ASTM B280 standards are designed to work with modern refrigerants such as R410A, R32, and other high-pressure refrigerants used in today's HVAC systems. These copper tubes ensure safe refrigerant flow and long-term reliability.

8.Can insulated copper pipes be used for both residential and commercial air conditioning systems?

Yes. Insulated copper line sets are widely used in both residential and commercial HVAC installations. They are suitable for mini split air conditioners, heat pumps, VRF systems, and central air conditioning units. Their durability and excellent heat transfer performance make them ideal for a wide range of cooling applications.

9.What insulation thickness is recommended for HVAC copper pipes?

The recommended insulation thickness depends on the installation environment. Common insulation thickness options include 8 mm, 10 mm, 13 mm, 19 mm, and 25 mm. Thicker insulation is typically recommended for outdoor installations or areas with extreme temperatures to prevent energy loss and improve system efficiency.

10.Why choose a professional HVAC copper line set manufacturer?

Choosing a professional HVAC copper pipe manufacturer ensures consistent product quality, high-purity copper materials, and durable insulation. Experienced manufacturers also provide OEM customization, strict quality control, and international certifications, making their products suitable for HVAC distributors, contractors, and global air conditioning projects.