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DBJ-003
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DABUND
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Copper
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1M - 10M
Material
Color
Keywords
Application
25 ft 3/8" x 5/8" Insulated Copper Pipe for Mini Split and HVAC Systems
The DABUND 25 ft 3/8" x 5/8" insulated copper pipe is designed for professional mini split, HVAC, heat pump, 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 can meet ASTM B280 and C12200 standards according to product specification, supporting reliable performance in modern HVAC refrigeration systems.
The 25-foot length is suitable for residential and light commercial air conditioning installations. It helps reduce unnecessary pipe connections, lowers potential refrigerant leakage points, and provides flexible routing for mini split and HVAC projects.
Key Specifications of the 3/8" x 5/8" Insulated Copper Line Set
This insulated copper pipe is manufactured for HVAC refrigerant flow, thermal protection, and installation reliability. The 3/8" + 5/8" configuration is commonly used for medium-capacity air conditioning systems when specified by the HVAC equipment manufacturer.
| Specification | Detail |
|---|---|
| Product Name | 25 ft 3/8" x 5/8" Insulated Copper Pipe |
| Product Type | Pre-insulated HVAC copper line set |
| 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 according to product specification |
| Insulation Certifications | ASTM E84, UL94, ASTM D1056, ASTM G21 according to selected material |
| Common Application | Mini split, heat pump, VRF/VRV, residential and commercial 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, stable refrigerant transmission, and mechanical strength for HVAC systems.
Excellent heat transfer efficiency
Strong resistance to corrosion and oxidation
High pressure tolerance for modern refrigerants such as R410A and R32 when specifications match
Long service life in HVAC and refrigeration systems
Because of these advantages, copper remains a widely used material 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, weather resistance, and long-term durability.
Outer Layer: UV-Resistant PE Film
The embossed UV-resistant polyethylene film helps protect the pipe from sunlight, aging, mechanical wear, and outdoor exposure.
Middle Layer: High-Density IXPE Foam
High-density IXPE foam insulation provides heat and cold resistance while helping absorb external impact during handling and installation.
Inner Layer: Closed-Cell Moisture Barrier
The closed-cell insulation structure helps prevent moisture penetration and supports stable temperature performance across the refrigerant line.
High-Performance Insulation for Energy Efficiency
The copper tubing is covered with high-quality insulation designed to maintain stable refrigerant temperatures, reduce energy loss, and improve HVAC system efficiency.
Helps prevent condensation formation
Improves HVAC energy efficiency
Provides UV and weather resistance
Protects copper pipes from moisture and corrosion
Supports ASTM E84 and UL94 flame-resistance requirements according to selected insulation material
99.9% Pure Copper
White PE Insulated Pipe
Copper Nut
Pipe Insulation Tubing Features
The pipe insulation tubing is designed for thermal protection, moisture control, UV resistance, and outdoor durability. It helps maintain refrigerant temperature, reduce energy loss, and protect the copper pipe during HVAC line set installation.
Thermal Insulation Pipe Production
Insulated Pipe Warehouse
Inner Layer Insulated Pipe
Flexible Copper Coil Design for Easy HVAC Installation
The 25 ft insulated copper coil allows HVAC technicians to route refrigerant lines through walls, ceilings, floors, and compact installation spaces more easily.
Easy cutting to the required installation length
Reduced number of connectors and joints
Faster installation process
Lower risk of refrigerant leakage
This flexibility makes the copper line set suitable for residential and light commercial HVAC projects where clean routing and reliable installation are important.
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 mini split air conditioners, heat pumps, VRF/VRV systems, residential central air conditioning, and commercial cooling systems.
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, approximately 36,000–48,000 BTU, when the HVAC equipment manufacturer specifies this line size.
Multiple Insulation Options for Different HVAC Environments
To meet different installation environments, this insulated copper pipe can be supplied with multiple insulation materials and thickness options.
White PE Insulation
White PE insulation is a practical option for many HVAC installations. Thickness options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm, and 25.4 mm.
Black Rubber Insulation
Black rubber insulation is suitable for projects requiring flexible, durable insulation performance. Thickness options include 13 mm, 17 mm, 19 mm, and 25.4 mm.
Custom HVAC Copper Line Sets Available
DABUND supports customization for HVAC distributors, wholesalers, contractors, importers, and private label brands that need customized insulated copper pipe solutions.
Custom copper pipe sizes
Different insulation thickness options
Custom pipe lengths
OEM logo printing on insulation
Private label packaging
Insulated Copper Pipe Size Options
| Size | Length | Insulation White PE | Flame Resistant |
| 1/4 + 3/8 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/4 + 1/2 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/4 + 5/8 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 5/8 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 3/4 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/2 + 3/4 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 7/8 | 3m / 4m / 5m / 7m / 10m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
Line Set Size and HVAC Capacity Reference
| Line Set Size | Common Ton / HP Range | Common BTU Range | Typical Application |
|---|---|---|---|
| 1/4 + 3/8 | 0.75 ton – 1.0 ton / 0.75P – 1P | 9000–12000 BTU / 9K–12K | Small mini split air conditioner |
| 1/4 + 1/2 | 1.5 ton – 2.0 ton / 1.5P – 2P | 12000–18000 BTU / 12K–18K | Medium mini split air conditioner |
| 1/4 + 5/8 | 2.0 ton – 2.5 ton / 2P – 2.5P | 24000–30000 BTU / 24K–30K | Split AC and heat pump system |
| 3/8 + 5/8 | 3.0 ton – 4.0 ton / 3P – 4P | 36000–48000 BTU / 36K–48K | Ductless commercial air conditioner |
| 3/8 + 3/4 | 4.5 ton – 6.0 ton / 4.5P – 6P | 54000–72000 BTU / 54K–72K | Large split AC installation |
| 3/8 + 7/8 | 6.0 ton – 8.0 ton / 6P – 8P | 72000–96000 BTU / 72K–96K | High-capacity ductless HVAC system |
Why Choose DABUND Insulated Copper Pipe
DABUND is a professional manufacturer of HVAC copper line sets with extensive production and export experience. The company supplies insulated copper pipes, mini split line sets, and HVAC installation accessories to global distributors and contractors.
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
OEM and private label support for distributors
DABUND Factory
We produce insulated copper pipe, mini split line set, aluminum pipe, and HVAC parts for global HVAC customers.
SGS Certificate
DABUND mini split line set insulation can be made of polypropylene or black rubber with UV resistance and can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 standards according to product specification.
Exhibition
DABUND joins HVAC exhibitions worldwide to help customers evaluate mini split line sets, insulated copper pipes, HVAC line sets, and HVAC parts face to face.
FAQ
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. It connects the indoor evaporator unit and outdoor condenser unit, allowing refrigerant to circulate between the two components.
Why are insulated copper pipes important for mini split air conditioners?
Insulated copper pipes prevent heat transfer between the refrigerant and surrounding air, helping the system maintain efficient cooling performance. They also reduce condensation and protect walls or building structures from moisture damage.
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 around 36,000–48,000 BTU or 3–4 tons. Installers should always verify the required pipe size according to the equipment manufacturer’s specifications.
Can a 25 ft insulated copper line set be cut during installation?
Yes. A 25 ft insulated copper pipe can be cut to the required length during HVAC installation. Professional technicians typically trim the pipe based on the distance between the indoor and outdoor units.
What type of insulation is used on HVAC copper pipes?
Most HVAC insulated copper pipes use closed-cell polyethylene foam or rubber insulation. This type of insulation provides thermal resistance, helps prevent condensation, and protects copper tubing from UV exposure and moisture.
How long do insulated copper pipes last in HVAC systems?
High-quality insulated copper HVAC pipes can provide long service life when properly installed and maintained. Copper is naturally resistant to corrosion and can withstand high refrigerant pressures when specifications match the system.
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.
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, including mini split air conditioners, heat pumps, VRF systems, and central air conditioning units.
What insulation thickness is recommended for HVAC copper pipes?
The recommended insulation thickness depends on the installation environment. Common options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm, and 25.4 mm. Thicker insulation is often used for outdoor or high-temperature environments.
Why choose a professional HVAC copper line set manufacturer?
A professional HVAC copper pipe manufacturer provides consistent product quality, high-purity copper materials, durable insulation, OEM customization, strict quality control, and international certification support for global HVAC distributors and contractors.
