100 ft 3/8″ × 7/8″ Pre-Insulated Copper Tube – HVAC Refrigerant Line Set

100 ft 3/8" x 7/8" Pre-Insulated Copper Tube for HVAC Refrigerant Line Set

The 100 ft 3/8" x 7/8" pre-insulated copper tube from Dabund is designed for long-distance HVAC refrigerant line connections in mini split air conditioners, ductless heat pumps, split systems, and light commercial HVAC installations. This line set includes a 3/8 inch liquid line and a 7/8 inch suction line, making it suitable for larger-capacity systems that require extended refrigerant piping.

With factory-applied insulation, high-purity copper tubing, and a continuous 100 ft length, this HVAC refrigerant line set helps reduce thermal loss, prevent condensation, save installation time, and maintain stable system performance across long line runs.

Product Overview – Long-Length Insulated Copper Refrigerant Tube

This pre-insulated copper tubing line set provides a continuous 100 ft run with factory-applied thermal insulation. It is engineered for HVAC projects where the indoor unit and outdoor condenser are positioned far apart, such as rooftop installations, large residential systems, detached outdoor units, and longer ductless heat pump connections.

• Line Set Length: 100 ft / approximately 30.48 m

• Liquid Line: 3/8" / approximately 9.52 mm

• Suction Line: 7/8" / approximately 22.23 mm

• Material: 99.9% pure copper

• Insulation: factory-applied white PE thermal insulation

• Application: mini split, ductless AC, heat pump, split system, HVAC refrigerant connection

The pre-insulated structure reduces the need for field insulation, helps control surface condensation, and supports efficient refrigerant temperature management during cooling and heating operation.

What Does 3/8" x 7/8" Copper Tube Mean?

3/8" Liquid Line

The 3/8 inch liquid line carries high-pressure liquid refrigerant from the outdoor condenser to the indoor evaporator. It is commonly used in larger HVAC systems where stable refrigerant feed is required.

7/8" Suction Line

The 7/8 inch suction line returns low-pressure refrigerant vapor back to the compressor. The larger suction line helps support higher refrigerant volume in larger mini split, ductless heat pump, and split air conditioning systems.

Designed for Extended HVAC Line Runs

The 100 ft length is suitable for installations where a standard short line set is not enough. It can reduce the need for multiple connections, helping lower leak risk and improve installation reliability.

Key Features and Benefits

Factory-Applied Insulation for Better Efficiency

The factory-applied insulation helps preserve refrigerant temperature, reduce heat gain or heat loss along the copper tube, and minimize condensation buildup. This supports better cooling and heating performance while reducing installation labor.

99.9% Pure Copper Construction

Dabund uses high-purity copper to provide excellent thermal conductivity, corrosion resistance, pressure resistance, and long-term durability for HVAC refrigerant line applications.

Suitable for Common HVAC Refrigerants

This pre-insulated copper tube can be used with common refrigerants such as R410A, R32, and similar modern HVAC refrigerants when installed according to system specifications and local codes.

Long-Length Line Set for Flexible Installation

The 100 ft line set gives installers more flexibility for routing refrigerant lines around building structures, walls, roofs, and outdoor unit locations.

HVAC Compatibility and Applications

This 100 ft 3/8" x 7/8" HVAC refrigerant line set is suitable for systems requiring larger suction line capacity and extended refrigerant piping.

• Ductless mini split air conditioners

• Ductless heat pump systems

• Split system air conditioners

• Residential HVAC setups

• Light commercial cooling systems

• Long-distance refrigerant line installations

• Rooftop or detached outdoor unit connections

The 3/8" x 7/8" size is commonly used for larger HVAC systems, including approximately 6.0–8.0 ton systems or 72,000–96,000 BTU applications depending on the equipment design. Final line set sizing should always follow the HVAC equipment manufacturer’s installation manual.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap Protection

Features of White PE Pipe Insulation Tubing

The white PE insulation is designed to protect the copper tube from heat transfer, moisture, condensation, UV exposure, and installation wear. It helps maintain system efficiency and supports long-term outdoor HVAC performance.

Thermal Insulation Pipe Production

Insulated Pipe Warehouse

Inner Layer Insulated Pipe

Technical Specifications

Installation Tips for Best Performance

Plan the Line Path Before Installation

Measure the distance between indoor and outdoor units before installation. Plan a smooth route with gentle bends and minimal sharp turns to reduce stress on the copper tube and insulation.

Protect Insulation at Wall Penetrations

Use wall sleeves, grommets, or protective conduit where the line set passes through walls or structural elements. This helps protect the insulation from compression, tearing, and moisture exposure.

Support the Line Set Properly

Secure the line set with HVAC-rated clips or straps to prevent vibration, sagging, and insulation damage over time. Proper support is especially important for long 100 ft refrigerant line runs.

Available Pre-Insulated Copper Tube Sizes

Pre-Insulated Copper Tube Size Guide

Why Choose Dabund 100 ft 3/8" x 7/8" Pre-Insulated Copper Tube?

Engineered for Extended HVAC Line Runs

The 100 ft length is suitable for projects where indoor and outdoor units are far apart. It helps installers avoid unnecessary joints and supports cleaner, more reliable refrigerant piping.

Consistent Thermal Performance

Factory insulation provides consistent thermal protection along the full tube length, helping reduce labor cost and material waste compared with field-applied insulation.

Strong and Durable Build

High-purity copper and durable insulation help the line set resist corrosion, thermal stress, environmental wear, and installation damage.

OEM and ODM Manufacturing Support

Dabund supports custom length, copper tube size, insulation thickness, insulation material, logo printing, packaging design, and private label supply for HVAC distributors, importers, wholesalers, and brand owners.

Dabund Factory

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

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, pre-insulated copper tubes, and HVAC parts face to face.

FAQ About 100 ft 3/8" x 7/8" Pre-Insulated Copper Tube

What is a 100 ft 3/8" x 7/8" pre-insulated copper tube used for?

It is used as an HVAC refrigerant line set to connect indoor and outdoor units in mini split air conditioners, ductless heat pumps, split systems, and light commercial HVAC installations requiring long refrigerant piping.

What does 3/8" x 7/8" mean?

It refers to the outer diameters of the refrigerant tubing. The 3/8 inch tube is usually the liquid line, and the 7/8 inch tube is usually the suction line for refrigerant return.

What HVAC system size is this copper line set suitable for?

The 3/8" x 7/8" size is commonly used for larger HVAC systems around 6.0–8.0 tons or 72,000–96,000 BTU, depending on system design. Always confirm with the HVAC equipment manufacturer’s installation manual.

Is this tube set already insulated?

Yes. The copper tubing comes with factory-applied insulation to help preserve refrigerant temperature, reduce condensation, and save installation time.

Can this pre-insulated copper tube be used outdoors?

Yes. The insulated jacket is designed for HVAC outdoor installation conditions and helps protect the copper tubing from weather exposure, UV damage, and moisture.

Is it compatible with R410A and R32 refrigerants?

Yes. It can be used with common refrigerants such as R410A and R32 when the HVAC system specifications and local installation codes are followed.

Why choose a 100 ft line set instead of shorter lengths?

A 100 ft line set is suitable for installations where indoor and outdoor units are far apart. It reduces the need for multiple short segments and can help lower joint-related leak risk.

Can Dabund customize the copper tube size or insulation thickness?

Yes. Dabund supports OEM and ODM customization, including tube size, line set length, insulation thickness, insulation material, logo printing, and packaging design.

What are your payment terms?

Common payment terms include T/T, L/C at sight, credit card, and other agreed payment methods based on order details.

What are your delivery terms?

Dabund can support EXW, FOB, CFR, CIF, and other international delivery terms according to customer requirements.

Are you a trading company or manufacturer?

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

Can I get a sample before bulk ordering?

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

How long is your delivery time?

The usual delivery time is 15–20 days. For urgent orders, Dabund can discuss faster production and delivery arrangements according to order quantity and current production schedule.