1/4" x 3/8" x 100 ft Refrigeration Copper Pipe | Pre-Insulated HVAC Line Set for Mini Split Systems

1/4" x 3/8" x 100 ft Refrigeration Copper Pipe for Mini Split HVAC Systems

The 1/4" x 3/8" x 100 ft refrigeration copper pipe from Dabund is a pre-insulated HVAC line set designed for mini split air conditioners, ductless heat pumps, refrigeration systems, and light commercial HVAC installations. It includes a 1/4 inch liquid line and a 3/8 inch suction line, making it suitable for small-capacity systems that require long refrigerant line runs.

This 100 ft pre-insulated copper line set is ideal for 0.75–1 ton or 9,000–12,000 BTU mini split systems. The 99.9% pure copper tubing, black rubber insulation, UV-resistant outer layer, and high pressure rating help ensure stable refrigerant flow, energy efficiency, and long-term HVAC performance.

Product Overview – Pre-Insulated HVAC Refrigeration Copper Line Set

This 100 ft refrigeration copper pipe provides a long-distance line set solution for connecting indoor and outdoor units in ductless mini split systems. The twin-line design combines liquid and suction refrigerant tubing in one pre-insulated structure, helping installers save time and reduce field insulation work.

• Line set size: 1/4" liquid line + 3/8" suction line

• Metric size: 6.35mm + 9.52mm outer diameter

• Length: 100 ft

• Material: 99.9% pure copper

• Copper standards: ASTM B280 and C12200

• Insulation: black rubber / polypropylene insulation options

• Typical system range: 0.75–1 ton / 9,000–12,000 BTU

• Application: mini split AC, heat pump, ductless HVAC, refrigeration systems

The 100 ft length gives installers more flexibility for long-distance HVAC projects, complex building layouts, and residential installations where the outdoor condenser is located far from the indoor unit.

Key Features of 1/4" x 3/8" Refrigeration Copper Pipe

1/4" x 3/8" Standard Mini Split Line Size

The 1/4" x 3/8" size refers to the outer diameter of the copper tubes. The 1/4" tube is commonly used as the liquid line, while the 3/8" tube is commonly used as the suction line for small mini split HVAC systems.

99.9% Pure Copper for HVAC Refrigerant Flow

The copper tubing is made from 99.9% pure copper and meets ASTM B280 and C12200 standards. High-purity copper provides strong thermal conductivity, pressure stability, corrosion resistance, and reliable refrigerant circulation.

Full AC Copper Size Range Available

Dabund can supply AC copper line sizes including 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", and 1 1/8". Custom lengths such as 15m, 20m, 25m, 30m, 50m, and 100 ft are available for different HVAC markets.

UV-Resistant and Fire-Rated Insulation

The insulation is designed with UV resistance, moisture protection, and flame-retardant performance. It can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 requirements depending on the product configuration.

High Pressure Rating for R410A and R32 Systems

The copper pipe supports a pressure rating from 2100 to 7000 PSI, which is much higher than typical HVAC operating requirements. It is suitable for common refrigerants such as R410A and R32 when the system specifications match.

OEM Printing on Insulation

Dabund produces insulation in-house and can print company name, size, meters, brand information, and private label details on the insulation jacket for OEM and wholesale buyers.

Copper Tube and Insulation Performance

Copper Tube: ASTM B280 and C12200 DHP

The copper tube is manufactured for HVAC and refrigeration applications requiring clean internal surfaces, stable wall thickness, reliable pressure resistance, and efficient refrigerant flow.

High-Density Closed-Cell Insulation

The insulation uses high-density closed-cell foam to reduce thermal loss, prevent moisture penetration, and control condensation. It is suitable for indoor and outdoor refrigerant line installation.

• Working temperature range: -40℃ to 120℃

• Meets or exceeds ASTM C1427-07 requirements

• UL94 flame-retardant performance

• ASTM E84 smoke and fire performance

• Superior tear resistance and UV resistance

• Moisture and condensation protection

99.9% Pure Copper

Black Rubber Insulated Pipe

Plastic Cap Protection

Features of Black Rubber Pipe Insulation Tubing

Black rubber insulation helps improve moisture condensation protection and thermal stability. The insulation material works as both an insulation layer and a moisture-proof layer, reducing the need for an additional water vapor protection layer in many HVAC installations.

• Material: black rubber insulation

• Temperature range: -40℃ to 120℃

• Better moisture and condensation control

• Insulation and moisture barrier in one structure

• Suitable for mini split, heat pump, and refrigeration line applications

100 ft Long Refrigeration Copper Pipe for Flexible Installation

The 100 ft copper line set gives installers more routing flexibility for long-distance HVAC installations, residential systems, light commercial projects, and complex layouts requiring extended piping.

• Long-distance mini split installation

• Residential and light commercial HVAC projects

• Complex layouts requiring extended piping

• Indoor-to-outdoor unit connections with longer distance

• Retrofit and replacement HVAC line set projects

The continuous line set design helps reduce unnecessary joints and can lower refrigerant leak risk when installed correctly.

99.9% Pure Copper Tubing for Higher Cooling Efficiency

Manufactured from high-purity copper, this pipe delivers superior thermal conductivity, excellent pressure resistance, and reliable long-term performance for HVAC refrigerant line applications.

• Meets ASTM B280 and C12200 standards

• Supports efficient refrigerant flow

• Improves cooling and heating performance

• Resists corrosion in HVAC environments

• Supports longer service life for refrigerant line systems

Advanced Insulation for Energy Efficiency and Protection

This insulated copper pipe uses high-density closed-cell insulation to reduce energy loss, prevent condensation, and keep refrigerant temperature stable. The insulation is suitable for outdoor use, humid environments, and standard HVAC installation conditions.

• UV-resistant outer layer

• Flame-retardant insulation performance

• Waterproof and moisture-resistant design

• Anti-corrosion protection for the copper line

• Noise reduction and shock absorption

Available Refrigeration Copper Pipe Sizes

HVAC Line Set Size Selection Guide

Ideal Copper Line Set Size for 9K–12K Mini Split Systems

The 1/4" x 3/8" copper line set is commonly used for 0.75 ton to 1 ton mini split systems, including 9,000 BTU and 12,000 BTU residential air conditioners.

• 1/4" liquid line for refrigerant feed

• 3/8" suction line for refrigerant return

• Used for 9K–12K BTU mini split AC systems

• Suitable for residential HVAC installations

• Supports efficient refrigerant flow and stable cooling performance

Compatible with Multiple HVAC and Refrigeration Applications

• Ductless mini split systems

• Heat pump systems

• Central air conditioning systems

• Residential refrigeration units

• Light commercial HVAC systems

• Replacement and retrofit line set projects

Final line set sizing should always follow the HVAC equipment manufacturer’s installation manual, especially for maximum line length, refrigerant type, and elevation difference requirements.

Full Size Range and Custom Length Options Available

Dabund supports customization for OEM, ODM, wholesale, and distributor projects. Buyers can customize copper tube size, insulation material, insulation thickness, length, logo printing, and packaging design.

• Sizes: 1/4" to 1 1/8"

• Lengths: 15m / 20m / 25m / 30m / 50m / 100 ft

• Insulation thickness options: 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm

• Logo printing on insulation

• Custom packaging and private label branding

• Bulk production support for importers and HVAC brands

OEM and ODM Refrigeration Copper Pipe Manufacturer

Dabund supports HVAC importers, distributors, contractors, wholesalers, and private-label brands with factory-direct refrigeration copper pipe production. Custom product specifications and packaging can help buyers expand their HVAC product line.

• Private label branding

• Logo printing on insulation jacket

• Custom packaging design

• Bulk production support

• Multiple insulation materials and colors

• Stable export supply for global HVAC markets

Designed for Global HVAC Markets and Extreme Conditions

This pre-insulated refrigeration copper pipe is suitable for different climate conditions and installation environments, including humid regions, hot climates, coastal areas, and standard residential HVAC markets.

• Tropical climates: moisture and condensation resistance

• Desert environments: heat and UV resistance

• Coastal areas: corrosion protection

• Residential buildings: clean and efficient mini split installation

• Light commercial projects: stable refrigerant line performance

Reduce Installation Failures and Improve HVAC Efficiency

Using high-quality copper tubing and reliable insulation helps reduce installation failure risk and supports better HVAC system performance. The right line set can help prevent refrigerant leaks, improve cooling efficiency, lower maintenance costs, and extend system lifespan.

Dabund Factory

Dabund produces insulated copper pipe, mini split line set, aluminum pipe, and HVAC parts for global HVAC buyers.

SGS Certificate

Mini split line set insulation can be made of polypropylene or black rubber with UV resistance and compliance with ASTM E84, UL94, ASTM D1056, and ASTM G21.

Exhibition and Global Market Experience

Dabund joins international exhibitions to help customers inspect mini split line sets, refrigeration copper pipes, and HVAC parts face to face.

FAQ About 1/4" x 3/8" x 100 ft Refrigeration Copper Pipe

What is a 1/4" x 3/8" refrigeration copper pipe used for?

This copper pipe is used as an HVAC refrigerant line set to connect indoor and outdoor units. It is commonly used for 9,000–12,000 BTU or 0.75–1 ton mini split air conditioners.

Why is insulated copper tubing important in HVAC systems?

Insulated copper tubing reduces heat loss, prevents condensation, improves energy efficiency, and protects the refrigerant pipe from corrosion, moisture, UV exposure, and environmental damage.

What standards should HVAC copper pipes meet?

High-quality HVAC copper pipes should meet ASTM B280 and C12200 standards to ensure durability, clean internal surfaces, pressure resistance, and compatibility with refrigeration applications.

Is this copper pipe compatible with R410A and R32 refrigerants?

Yes. This copper pipe supports modern refrigerants such as R410A and R32 when the HVAC system specifications, pressure requirements, and local installation codes are followed.

What size AC system uses a 1/4" x 3/8" line set?

A 1/4" liquid line and 3/8" suction line is typically used for small-capacity systems around 9,000–12,000 BTU, making it suitable for residential mini split installations.

Can I customize the copper pipe length and insulation?

Yes. Dabund offers OEM and ODM services for custom length, insulation thickness, insulation color, insulation material, logo printing, and packaging for bulk orders.

What are the benefits of pre-insulated copper pipes?

Pre-insulated copper pipes save installation time, improve system efficiency, reduce condensation, protect the copper tube, and lower overall installation cost compared with field-wrapped insulation.

How long does refrigeration copper pipe last?

A high-quality refrigeration copper pipe can last 15–20 years or more, depending on installation quality, insulation protection, operating environment, and HVAC system maintenance.

Can this 100 ft copper line set be cut during installation?

Yes. The 100 ft copper line set can be cut to the required length. After cutting, proper deburring, flaring, sealing, vacuuming, and pressure testing are required.

Is this line set suitable for outdoor installation?

Yes. The UV-resistant and moisture-resistant insulation makes it suitable for standard outdoor HVAC installation. In harsh environments, additional protection may be recommended.

Are you a manufacturer or trading company?

Dabund is a manufacturer of refrigeration copper pipes, mini split line sets, insulated copper pipes, aluminum pipes, and HVAC parts.

Can I get a sample before bulk ordering?

Yes. Dabund can provide samples for evaluation. Buyers usually need to cover the express shipping cost.