3/8 in × 7/8 in × 100 ft Insulated Copper Pipe for Split AC – Premium HVAC Refrigerant Line

100 ft 3/8" x 7/8" Insulated Copper Pipe for Split AC & HVAC

The DABUND 100 ft 3/8" x 7/8" insulated copper pipe is a long-length HVAC refrigerant line solution for compatible split air conditioners, ductless systems, heat pumps, and other refrigeration applications. The paired copper tubing combines a 3/8" (9.52 mm) liquid line with a 7/8" (22.22 mm) suction line and factory-applied insulation for professional HVAC installations.

With a continuous length of approximately 100 ft (30.5 m), this pre-insulated copper line is designed for projects where the indoor and outdoor HVAC units are positioned farther apart, including large residential systems, commercial installations, rooftop equipment, multi-story buildings, and retrofit projects.

DABUND uses 99.9% pure copper and can supply tubing according to ASTM B280 requirements using C12200 copper according to the ordered specification. Custom insulation thicknesses, lengths, printed markings, and private-label packaging are available for HVAC distributors, wholesalers, contractors, importers, and OEM customers.

What Is a 3/8" x 7/8" HVAC Refrigerant Line?

A refrigerant line set uses two copper tubes to carry refrigerant between the indoor and outdoor components of an HVAC system. The two tubes have different diameters because liquid refrigerant and refrigerant vapor have different flow requirements.

3/8" Liquid Line

The smaller tube has an outside diameter of 3/8" or approximately 9.52 mm. In HVAC equipment designed for this pipe combination, it is commonly used as the liquid refrigerant line.

7/8" Suction Line

The larger tube has an outside diameter of 7/8" or approximately 22.22 mm. It is commonly used as the suction or vapor line when specified by the air conditioner or heat pump manufacturer.

Why Are Two Different Pipe Diameters Required?

The correct liquid-line and suction-line diameters help manage refrigerant velocity, pressure drop, oil return, and system performance. Pipe dimensions should therefore always match the specifications of the exact HVAC equipment being installed.

100 ft 3/8" x 7/8" Copper Pipe Technical Specifications

99.9% Pure Copper for HVAC Refrigerant Piping

Copper is widely used in HVAC and refrigeration systems because it combines thermal conductivity, corrosion resistance, pressure performance, workability, and long service life.

ASTM B280 Copper Tubing

DABUND copper tubing can be supplied according to ASTM B280, a specification commonly referenced for seamless copper tube used in air conditioning and refrigeration field service.

C12200 Copper

C12200 copper can be supplied according to the ordered tubing specification, providing the combination of formability, corrosion resistance, and thermal properties required for HVAC refrigerant piping.

Pressure Performance

Available copper tubing pressure ratings can vary from approximately 2100 to 7000 PSI depending on tube diameter, wall thickness, temper, and specification. Final tubing selection should be based on the refrigerant, design pressure, equipment manufacturer requirements, and applicable installation standards.

Why Use Pre-Insulated Copper Pipe for Split AC?

Factory-applied insulation creates a consistent thermal barrier around the refrigerant tubing before shipment and reduces the amount of insulation work required at the installation site.

Reduces Unwanted Heat Transfer

Correct insulation helps reduce heat gain or heat loss between the refrigerant tubing and surrounding air, supporting stable HVAC operating conditions.

Helps Control Condensation

Closed-cell insulation limits contact between cold copper tubing and warm humid air, reducing surface condensation and helping protect surrounding building materials.

Reduces Field Installation Work

Because insulation is applied during manufacturing, HVAC contractors can reduce field wrapping work and obtain more consistent insulation coverage along the line.

99.9% Pure Copper

White PE Insulated Pipe

Protected Copper Tube Ends

Multi-Layer White PE Insulation

DABUND white PE insulation can use a multi-layer structure designed to provide thermal protection, moisture resistance, and physical protection for HVAC copper tubing.

• Outer Layer: protective PE surface designed for wear and environmental resistance

• Middle Layer: foam insulation designed to reduce heat transfer

• Inner Layer: closed-cell structure designed to reduce moisture penetration

Thermal Insulation Pipe Production

Insulated Pipe Warehouse

Inner Insulation Layer

White PE and Black Rubber Insulation Options

White PE Insulation

Available white PE insulation thicknesses include approximately 8 mm, 9 mm, 10 mm, 13 mm, 19 mm, and 25.4 mm, supporting different climates and project specifications.

Black Rubber Insulation

Black rubber insulation is also available for HVAC applications requiring a flexible closed-cell insulation material. Available thicknesses depend on the selected product configuration.

UV and Moisture Resistance

Selected insulation configurations offer UV and moisture resistance for HVAC installations. When piping remains exposed outdoors for extended periods, project requirements may call for an additional line-set cover, conduit, or other mechanical protection.

Insulation Test Standards

Depending on the selected insulation material and product specification, DABUND test documentation can reference ASTM E84, UL 94, ASTM D1056, and ASTM G21. Buyers requiring specific compliance documents should request the applicable report for the exact configuration being ordered.

Why Choose a 100 ft HVAC Refrigerant Line?

A continuous 100 ft copper coil can be useful for HVAC projects where indoor and outdoor equipment are separated by a substantial distance. A longer continuous run can also reduce the need for intermediate refrigerant pipe joints when the system design allows it.

Long-Distance HVAC Installations

The 100 ft length can support projects such as rooftop condensers, multi-story buildings, detached outdoor units, larger residential properties, and commercial HVAC installations where a shorter line set may not provide enough routing distance.

Fewer Intermediate Connections

Using a continuous copper coil can reduce the number of intermediate connections required along a long refrigerant piping route, provided the installation remains within the HVAC equipment manufacturer's piping limits.

Flexible Field Routing

Annealed copper tubing can be routed through suitable walls, ceilings, risers, equipment areas, and outdoor pathways using proper HVAC bending and support methods.

Is 3/8" x 7/8" the Correct Size for Your HVAC System?

A 3/8" liquid line and 7/8" suction line are used on certain larger-capacity HVAC systems. However, refrigerant pipe sizing cannot be determined reliably from BTU capacity, horsepower, or tonnage alone.

Different HVAC manufacturers can specify different pipe diameters for equipment with similar nominal capacities. Always confirm the exact liquid-line and suction-line requirements before ordering.

Check These Specifications Before Purchasing

• Required liquid-line diameter

• Required suction-line diameter

• Copper tube wall thickness

• Refrigerant type

• Maximum permitted piping length

• Maximum vertical elevation difference

• Required insulation thickness

• Additional refrigerant charge requirements

R410A, R32 and HVAC Refrigerant Applications

DABUND copper tubing can be supplied for HVAC systems using refrigerants such as R410A, R32, R22, and other refrigerants when the tube diameter, wall thickness, pressure rating, cleanliness, joining method, and equipment specifications are correctly matched.

Refrigerant compatibility should not be determined by pipe diameter alone. Always follow the air conditioner or heat pump manufacturer's technical documentation and applicable installation requirements.

Applications of 100 ft Insulated HVAC Copper Pipe

• Split air conditioning systems

• Ductless HVAC systems

• Heat pump refrigerant piping

• Large residential HVAC projects

• Commercial air conditioning systems

• Multi-story building installations

• Rooftop HVAC equipment

• Retrofit and replacement refrigerant piping

Available Insulated Copper Pipe Sizes

DABUND manufactures paired insulated copper tubing in multiple sizes, lengths, and insulation thicknesses for different HVAC equipment specifications and international markets.

HVAC Copper Line Size Selection Guide

The following information is a general reference only. Refrigerant pipe size varies by equipment manufacturer and model, so final selection must follow the exact HVAC equipment specification.

Important: Do not choose refrigerant pipe size solely from BTU, horsepower, or tonnage. Always use the liquid-line and suction-line dimensions specified for the exact HVAC equipment model.

Installation Considerations for a 100 ft Refrigerant Line

Confirm the Maximum Permitted Line Length

A 100 ft copper coil does not mean every HVAC system can operate with a 100 ft installed refrigerant run. Check the equipment manufacturer's maximum piping length before installation.

Check the Maximum Elevation Difference

For multi-story or rooftop projects, verify the maximum permitted vertical distance between the indoor and outdoor units. Elevation limitations can be different from total piping-length limitations.

Check Additional Refrigerant Requirements

Many HVAC systems include a factory refrigerant charge for only a specified standard piping length. Longer refrigerant runs may require additional refrigerant according to the manufacturer's charge-per-foot or charge-per-meter instructions.

Avoid Sharp Bends and Kinks

Use appropriate HVAC copper tube-bending methods and maintain a suitable bend radius. Flattened or kinked tubing can restrict refrigerant flow and should not be used.

Maintain Insulation Continuity

Protect the insulation during routing and avoid tearing, crushing, or excessive compression. Joints and repaired sections should be properly insulated to reduce condensation and thermal bridging.

Keep Copper Tube Ends Sealed

Keep the copper ends capped or sealed until final preparation and connection to reduce the risk of moisture, dust, and other contamination entering the refrigerant piping.

Leak Test and Evacuate Before Startup

After completing refrigerant connections, follow the equipment manufacturer's procedures for leak checking, pressure testing where applicable, vacuum evacuation, refrigerant adjustment, and final system commissioning.

OEM Insulated Copper Pipe Manufacturer and Supplier

DABUND supplies insulated copper tubing and HVAC refrigerant line sets for distributors, wholesalers, importers, contractors, HVAC brands, and project suppliers.

Custom Copper Pipe Sizes

Available copper tube sizes include 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", and 1-1/8", supporting multiple liquid-line and suction-line combinations.

Custom Coil Lengths

Standard long-coil options include 15 m, 20 m, 25 m, 30 m, and 50 m. Other lengths can be discussed according to OEM order quantity and project requirements.

Custom Insulation

Buyers can select insulation material and thickness according to climate, project conditions, customer specifications, and target-market requirements.

OEM Printing and Private Label Packaging

DABUND supports custom company names, pipe sizes, meter markings, logos, labels, cartons, and private-label packaging for wholesale and distribution customers.

Why Choose DABUND for Insulated HVAC Copper Pipe?

HVAC Manufacturing Experience Since 2008

DABUND has manufactured HVAC products since 2008, including insulated copper pipe, mini split line sets, refrigeration copper tubing, aluminum pipe, and related HVAC components.

In-House Insulation Production

In-house insulation production supports control over insulation thickness, appearance, printed markings, OEM customization, and production scheduling.

B2B and International Supply

DABUND supports international HVAC distributors, importers, contractors, and private-label brands with bulk production, customized product configurations, and export supply.

DABUND HVAC Factory

DABUND produces insulated copper pipe, mini split line sets, refrigeration copper tubing, aluminum pipe, and related HVAC parts.

SGS Testing and HVAC Insulation Standards

Copper tubing can be supplied according to ASTM B280 and C12200 specifications. Depending on the selected insulation material and product configuration, test documentation can reference ASTM E84, UL 94, ASTM D1056, and ASTM G21.

B2B buyers requiring compliance documentation should request the technical specification and test report applicable to the exact insulated copper pipe configuration being ordered.

DABUND HVAC Exhibitions

DABUND participates in international HVAC exhibitions where distributors, contractors, importers, and professional buyers can inspect insulated copper pipe, mini split line sets, insulation materials, and other HVAC products.

FAQ About 100 ft 3/8" x 7/8" Insulated Copper Pipe

What is a 3/8" x 7/8" insulated copper line used for?

It is a paired refrigerant piping configuration used on compatible split air conditioners, heat pumps, and other HVAC systems. The 3/8" tube is commonly the liquid line and the 7/8" tube the suction or vapor line when specified by the equipment manufacturer.

What are 3/8" and 7/8" copper tubing sizes in millimeters?

A 3/8" copper tube has an outside diameter of approximately 9.52 mm, while a 7/8" tube has an outside diameter of approximately 22.22 mm.

How long is 100 ft of copper pipe in meters?

100 ft is approximately 30.5 meters.

What HVAC system size uses a 3/8" x 7/8" line set?

This pipe combination is used on certain larger-capacity HVAC systems, but equipment with similar BTU or tonnage ratings can require different pipe sizes. Always verify the liquid and suction line dimensions specified for the exact HVAC model.

Can the 100 ft copper pipe be cut to a shorter length?

Yes. Professional HVAC technicians can cut the copper tubing to the required installation length. Any new flare, braze, or connection must be prepared according to the equipment manufacturer's procedures and applicable HVAC installation requirements.

Can I use the full 100 ft length on any HVAC system?

No. Each HVAC system has maximum piping-length and elevation limits. Check the equipment manufacturer's installation manual before using a long refrigerant run.

Does a 100 ft refrigerant line require additional refrigerant?

It may. Many systems include a factory refrigerant charge for only a specified piping length. Longer runs may require additional refrigerant according to the manufacturer's charge-per-foot or charge-per-meter specification.

Is this copper pipe compatible with R410A and R32?

It can be supplied for compatible R410A, R32, R22, and other HVAC applications when the tube diameter, wall thickness, pressure rating, cleanliness, fittings, and equipment specifications are correctly matched.

Why is the copper refrigerant line pre-insulated?

Insulation helps reduce unwanted heat transfer, control condensation around cold refrigerant tubing, and reduce field insulation work during installation.

Do I need extra protection for outdoor installation?

Selected insulation options provide UV and weather resistance. However, a line-set cover, conduit, or other mechanical protection may be recommended for prolonged sunlight, weather exposure, or locations subject to physical damage.

Can DABUND customize the insulated copper pipe?

Yes. DABUND supports OEM and ODM services including custom tube sizes, lengths, insulation materials, insulation thicknesses, company-name printing, meter markings, labels, cartons, and private-label packaging.

Is DABUND a manufacturer or trading company?

DABUND is a manufacturer of insulated copper pipe, HVAC refrigerant line sets, mini split line sets, aluminum pipe, and related HVAC parts.

Can I get a sample before placing a bulk order?

Yes. DABUND can provide up to 3 pieces of free samples for evaluation. Buyers normally cover the express shipping cost.

Can DABUND print my company logo?

Yes. DABUND accepts OEM and ODM orders and can customize company names, pipe sizes, meter markings, labels, logos, cartons, and private-label packaging.

What payment terms are available?

Common payment options can include T/T, L/C at sight, credit card, and other agreed payment methods according to order details.

What delivery terms does DABUND support?

Available international trade terms can include EXW, FOB, CFR, CIF, and other agreed Incoterms depending on customer logistics requirements.

What is the typical delivery time?

Typical production and delivery preparation is approximately 15–20 days depending on order quantity, customization requirements, and current production scheduling.