50 ft 1/4″ × 3/8″ Pre-Insulated Copper Tubing – HVAC Refrigerant Line Set

50 ft 1/4" x 3/8" Pre Insulated Copper Tubing for HVAC

The 50 ft 1/4" x 3/8" pre insulated copper tubing is designed for efficient refrigerant transfer in mini split air conditioners, ductless HVAC systems, heat pumps and split system installations where moderate line length is required.

This HVAC refrigerant line set includes a 1/4" liquid line and a 3/8" suction line with factory-applied insulation. The pre-insulated structure helps reduce thermal loss, minimize condensation and support stable cooling and heating performance.

For HVAC contractors, distributors and wholesalers, Dabund 50 ft pre insulated copper tubing provides a reliable solution for residential and light commercial mini split installation projects.

Product Overview: Pre-Insulated HVAC Refrigerant Tubing

This pre insulated copper tubing line set provides a continuous 50 ft run for connecting indoor and outdoor HVAC units. Factory-applied insulation helps maintain refrigerant temperature, reduce heat gain and heat loss, and prevent pipe surface condensation.

The 1/4" liquid line carries high-pressure refrigerant from the outdoor condenser to the indoor evaporator, while the 3/8" suction line returns low-pressure refrigerant vapor back to the compressor.

This size pairing is commonly used in small mini split and ductless air conditioner systems. Final line size, length and refrigerant charge should always follow the equipment manufacturer’s installation manual.

Key Features of 50 ft 1/4" x 3/8" Pre Insulated Copper Tubing

• 50 ft / 15.24 m pre insulated copper tubing for HVAC refrigerant line installation.

• 1/4" liquid line and 3/8" suction line for compatible mini split systems.

• Factory-applied insulation helps maintain stable refrigerant temperature.

• Made from 99.9% pure copper for reliable refrigerant flow.

• Suitable for mini split AC, ductless HVAC and heat pump systems.

• Designed for residential and light commercial HVAC installations.

• Compatible with common refrigerants such as R410A and R32 when installed correctly.

• White PE insulation provides a clean appearance and thermal protection.

• Pre-insulated design saves time compared with field-wrapped insulation.

• OEM printing, custom packaging and bulk supply are available.

Line Size Explained: 1/4" and 3/8" Configuration

1/4" Liquid Line

The 1/4" copper tube is generally used as the liquid line. It carries liquid refrigerant from the outdoor unit toward the indoor evaporator coil in compatible mini split and split AC systems.

3/8" Suction Line

The 3/8" copper tube is generally used as the suction line. It returns refrigerant vapor from the indoor unit back to the outdoor compressor.

Common Mini Split Application

The 1/4" x 3/8" line set configuration is commonly used for 0.75 ton to 1.0 ton mini split air conditioners, including many 9,000 BTU to 12,000 BTU systems.

Factory-Applied Insulation for HVAC Performance

Maintains Refrigerant Temperature

Factory-applied insulation helps maintain consistent refrigerant temperature throughout the line run. This supports stable cooling and heating performance in mini split HVAC systems.

Reduces Heat Gain and Heat Loss

Proper insulation helps reduce unnecessary heat transfer between the refrigerant line and the surrounding environment, supporting system efficiency and reducing energy waste.

Minimizes Surface Condensation

Insulated tubing helps reduce surface condensation, also called pipe sweating. This is important for protecting walls, ceilings, insulation materials and nearby building surfaces in humid environments.

Saves Installation Time

Pre-insulated copper tubing eliminates the need for most field-wrapped insulation work, helping HVAC installers save labor time and maintain consistent insulation coverage.

Key Benefits for Mini Split and Ductless HVAC Systems

Efficient Refrigerant Transfer

The pre-insulated design helps preserve refrigerant conditions along the full line set, supporting efficient cooling and heating cycles in compatible HVAC systems.

Durable Copper Construction

Made from 99.9% pure copper, this tubing provides good thermal conductivity, corrosion resistance and mechanical strength for long-term HVAC refrigerant line performance.

Reduced Moisture Risk

Factory insulation helps reduce condensation on the tubing surface, lowering the risk of water marks, mildew and moisture-related damage near the refrigerant line.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap Protection

Features of Pipe Insulation Tubing

The insulation tubing is designed to protect copper refrigerant lines from temperature loss, condensation and outdoor exposure. White PE insulation offers a clean appearance and practical thermal protection for mini split installations.

• Factory-applied thermal insulation for consistent coverage.

• Helps reduce heat gain and heat loss along the line set.

• Helps minimize condensation on the pipe surface.

• Protects the copper line during indoor and outdoor HVAC installation.

• Available insulation thickness options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm.

• Flame-resistant options such as M1 and B1 are available.

Thermal Insulation Pipe Production

Insulation Pipe Warehouse

Inner Layer Insulated Pipe

HVAC Compatibility and Applications

This 50 ft 1/4" x 3/8" pre insulated copper tubing is suitable for moderate indoor-to-outdoor unit distances in residential and light commercial HVAC projects.

• Mini split air conditioners.

• Ductless AC systems.

• Ductless heat pump systems.

• Residential HVAC installations.

• Light commercial HVAC applications.

• Split system replacement and new installation projects.

The tubing is compatible with widely used HVAC refrigerants including R410A, R32 and similar refrigerants when installed according to manufacturer guidelines and local code requirements.

Technical Specifications

Installation Tips for Optimal Performance

Plan the Line Path Before Installation

Measure the total distance between indoor and outdoor units before installation. Choose the most efficient routing to reduce sharp bends and protect refrigerant flow.

Protect Insulation at Penetrations

Where the line set passes through walls or structural openings, use protective sleeves, wall covers or grommets to prevent insulation damage and preserve thermal performance.

Secure Tubing with HVAC-Rated Supports

Use clips, straps or professional HVAC brackets to secure the tubing along its run. Proper support reduces vibration, prevents sagging and protects insulation integrity.

Follow Equipment Manufacturer Requirements

Always confirm line size, maximum line length, refrigerant charge, flare connection and installation method according to the HVAC equipment manufacturer’s manual.

Pre Insulated Copper Tubing Size Options

Recommended Applications by AC Capacity

Why Choose Dabund 50 ft 1/4" x 3/8" Pre Insulated Copper Tubing?

Reliable Performance for HVAC Professionals

Engineered with pre-insulated lines and high-quality copper, this tubing supports stable performance, energy efficiency and low maintenance for HVAC contractors and installers.

Saves Time and Labor on Installation

Factory insulation eliminates most on-site insulation wrapping, reducing labor cost and improving installation consistency across multiple jobs.

Trusted for Residential and Commercial Projects

Whether installing a new mini split system at home or servicing light commercial HVAC systems, this line set delivers practical performance and consistent refrigerant line protection.

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 with polypropylene or black rubber with UV resistance, meeting ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.

Exhibition

Dabund joins HVAC exhibitions worldwide to present mini split line set products and communicate directly with distributors, contractors and HVAC brands.

FAQ

What does 1/4" x 3/8" mean?

It refers to the outer diameters of the refrigerant lines. The 1/4" tube is typically the liquid line, and the 3/8" tube is typically the suction line.

What is 50 ft 1/4" x 3/8" pre insulated copper tubing used for?

It is used to connect indoor and outdoor units in mini split air conditioners, ductless AC systems and heat pumps where a 50 ft refrigerant line run is required.

What AC capacity is 1/4" x 3/8" commonly used for?

The 1/4" x 3/8" line set is commonly used for 0.75 ton to 1.0 ton mini split systems, including many 9,000 BTU to 12,000 BTU air conditioners.

Is this tubing insulated?

Yes. This product includes factory-applied insulation designed to reduce thermal loss, minimize condensation and eliminate the need for additional field insulation in many standard installations.

Can this line set be used outdoors?

Yes. The insulation jacket is suitable for outdoor refrigerant runs when installed according to HVAC equipment requirements and local installation standards.

Is this tubing compatible with R410A and R32 systems?

Yes. This pre insulated copper tubing is compatible with commonly used refrigerants such as R410A, R32 and other modern HVAC refrigerants when installed according to system and local code requirements.

Does this tubing need additional insulation on site?

In many standard installations, additional insulation is not required because the copper tubing already comes with factory-applied insulation. Project requirements may vary.

Can Dabund provide other tubing sizes and lengths?

Yes. Dabund can supply multiple line set sizes and lengths, including 15 m, 20 m, 25 m, 30 m and 50 m, with different insulation thickness options.

Are you a trading company or manufacturer?

Dabund is a manufacturer of insulated copper pipe, mini split line set, aluminum pipe and HVAC parts.

Can I get a free sample?

Yes. Dabund can provide qualified customers with 3 pieces of free samples. Express cost may need to be covered by the buyer. You can request samples through the free sample page.

Can I print my logo on the insulation?

Yes. Dabund supports OEM and ODM customization, including logo printing, size marking, length marking and custom packaging.

What payment terms are available?

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

What delivery terms can you offer?

Dabund can offer common international trade terms such as EXW, FOB, CFR and CIF.

How long is your delivery time?

Normal delivery time is usually 15 to 20 days. For urgent orders, production and shipment can be arranged in advance according to factory schedule.