25 ft 1/4" x 1/2" HVAC Line Set | Pre-Insulated Copper Refrigerant Line for Mini Split Systems

Looking for a reliable and easy-to-install HVAC line set?
This 25 ft 1/4" x 1/2" pre-insulated copper line set is designed for mini split air conditioners, heat pumps, and refrigeration systems, delivering excellent performance, durability, and installation efficiency.

Ideal for 1.5–2 Ton (12,000–18,000 BTU) systems, it ensures stable refrigerant flow and long-term system reliability.

The Mini Split Air Conditioner Line Set is twin already. So buy it now.

Standard 25 ft Length for Most HVAC Installations

This 25 ft copper line set is the most commonly used length for:

• Residential mini split installations

• Standard indoor-to-outdoor unit connections

• Replacement HVAC line sets

A perfect balance between flexibility and efficiency

99.9% Pure Copper Tubing (ASTM B280 & C12200 Certified)

Manufactured using high-purity copper, this line set provides:

• Superior thermal conductivity

• Strong pressure resistance

• Leak-free performance

✔ Meets ASTM B280 & C12200 standards

Ensures efficient cooling and long service life

High Pressure Rating for R410A & R32 Refrigerants

Built for modern HVAC systems:

• Pressure rating: 2100–7000 PSI

• Compatible with high-efficiency refrigerants

• Stable performance under demanding conditions

Designed for next-generation air conditioning systems

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap

Features of pipe insulation tubing:

Machines for the production of thermal insulation pipes

warehouse for insulation pipes

Inner Layer Insulated Pipe

Advanced Insulation for Energy Efficiency & Protection

This insulated copper line set features:

• High-density closed-cell insulation

• Condensation prevention

• Thermal stability

✔ Working temperature range: -40°C to 120°C

Reduces energy loss and improves system efficiency

UV-Resistant & Fire-Rated Insulation for Outdoor Use

Engineered for durability:

• UV-resistant outer layer

• Flame-retardant (UL94, ASTM E84 compliant)

• Moisture-proof and anti-aging

Suitable for both indoor and outdoor HVAC installations

Ideal Line Set Size for 1.5–2 Ton Mini Split Systems

This configuration includes:

• 1/4" liquid line

• 1/2" suction line

Commonly used for:

• 12,000 – 18,000 BTU systems

• 1.5–2 Ton mini split air conditioners

Ensures optimal refrigerant flow and system efficiency

Compatible with Multiple HVAC & Refrigeration Applications

Widely used in:

• Ductless mini split systems

• Heat pumps

• Central air conditioning systems

• Refrigeration equipment

One versatile solution for multiple HVAC needs

3-Layer Insulation Structure for Long-Term Durability

Advanced insulation design includes:

• Outer Layer: UV-resistant PE film

• Middle Layer: High-density IXPE foam

• Inner Layer: Closed-cell moisture barrier

✔ Waterproof
✔ Anti-corrosion
✔ Noise reduction
✔ Shock absorption

Built for long-term performance in harsh environments

Flexible Copper Tubing for Easy Installation

✔ Soft annealed copper for easy bending
✔ Twin-line design for faster installation
✔ Pre-insulated for reduced labor

Saves installation time and cost

## Full Size Range & Custom Length Options Available

We support OEM customization:

• Sizes: 1/4" – 1 1/8"

• Lengths: 3m / 5m / 7m / 10m / 25 ft / 50 ft

• Insulation thickness options

Ideal for wholesale and project-based supply

HVAC Line Set

1/4 + 3/8 HVAC line set used for 0.75TON - 1.0TON mini split air conditioner.

1/4 + 1/2 Mini split line set used for 1.5TON - 2.0TON mini split air conditioning.

1/4 + 5/8 Copper line set used for 2.0TON - 2.5TON split air conditioner system.

3/8 + 5/8 Insulated copper tube apply for 3.0TON - 4.0TON ductless mini split air conditioner.

3/8 + 3/4 Insulated copper tubing used for 4.5TON - 6.0TON split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 6.0TON - 8.0TON ductless mini split air conditioner.

Air conditioning copper line sets 1/4 + 3/8 used for 0.75P and 1P split air conditioning.

Copper pipe kit 1/4 + 1/2 commonly used for 1.5P and 2P mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 2P and 2.5air conditioner system.

3/8 + 5/8 Mini-split copper line set apply for 3P and 4P ductless mini split air conditioner.

3/8 + 3/4 Copper pipe kit used for 4.5P and 6P split aircon installation.

3/8 + 7/8 Insulated copper pipe apply for 6P - 8p TON ductless mini split air conditioner.

1/4 + 3/8 Mini split line set used for 9000BTU and 12000 BTU split air conditioner.

All copper line set 1/4 + 1/2 commonly used for 12000 BTU and 18000 BTU mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24000 BTU and 30000 BTU air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36000 BTU and 48000 ductless air conditioner.

3/8 + 3/4 HVAC lineset used for 54000 BTU and 72000 split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 72000 BTU - 96000 BTU ductless mini split air conditioner.

Aircon copper line set 1/4 + 3/8 used for 9K and 12K split air conditioner.

High quality copper line set 1/4 + 1/2 commonly used for 12K and 18K mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24K and 30K air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36K and 48K ductless air conditioner.

3/8 + 3/4 HVAC lineset used for 54K and 72K split air conditioner installation.

3/8 + 7/8 Insulated copper pipe apply for 72K - 96K ductless mini split air conditioner.

OEM & ODM HVAC Line Set Manufacturer for Bulk Buyers

Expand your HVAC business with:

• Private label branding

• Logo printing on insulation

• Custom packaging

• Bulk production capability

Perfect for distributors, importers, and HVAC brands

Designed for Global HVAC Markets & Harsh Environments

This line set performs reliably in:

• Tropical climates (humidity resistance)

• Desert environments (heat resistance)

• Coastal areas (corrosion protection)

Built for worldwide applications

HVAC Line Set Size Selection Guide

• 1/4" + 3/8" → 9K–12K BTU

• 1/4" + 1/2" → 12K–18K BTU (This Product)

• 1/4" + 5/8" → 24K–30K BTU

• 3/8" + 5/8" → 36K–48K BTU

• 3/8" + 7/8" → 72K–96K BTU

Helps buyers quickly select the correct size

Reduce Installation Failures & Improve HVAC Efficiency

Using a high-quality line set helps:

✔ Prevent refrigerant leaks
✔ Reduce energy loss
✔ Improve cooling performance
✔ Extend system lifespan

Small component, big impact on system reliability

Get a Quote for 25 ft 1/4" x 1/2" HVAC Line Set

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Start your project with confidence

DABUND FACTORY

We produce Insulated Copper Pipe, Mini Split Line Set and Aluminum Pipe and HVAC Parts

SGS Certificate

Mini Split Line Set is made of Polypropylene or Black Rubber with UV Resistant, meets ASTM E 84, UL94, ASTM D1056 and ASTM G 21

Exhibition

We join the exhibitions all over the word, just to facilitate customers to experience our mini split line set face to face.

FAQ

1.What is a 1/4" x 1/2" HVAC line set used for?

A 1/4" x 1/2" HVAC line set is used to connect indoor and outdoor units in air conditioning systems, typically for 12,000–18,000 BTU (1.5–2 Ton) mini split systems, ensuring efficient refrigerant flow.

2.Why is 25 ft the most common HVAC line set length?

A 25 ft line set is widely used because it fits most residential installations, providing enough length for standard indoor-to-outdoor unit connections without requiring extensions.

3.What material is best for HVAC line sets?

High-quality HVAC line sets are made from 99.9% pure copper (ASTM B280, C12200) due to its excellent thermal conductivity and durability.

4.Why is insulation important for copper line sets?

Insulation prevents heat loss, reduces condensation, and protects the copper pipe from environmental damage, improving system efficiency and lifespan.

5.Is this line set compatible with R410A and R32 refrigerants?

Yes. This line set supports modern refrigerants such as R410A and R32, thanks to its high pressure rating and durable copper construction.

6.Can I customize HVAC line sets for my brand?

Yes. Manufacturers offer OEM & ODM services, including custom lengths, insulation types, logo printing, and packaging for bulk orders.

7.What are the advantages of pre-insulated copper line sets?

Pre-insulated line sets:

• Save installation time

• Improve energy efficiency

• Reduce condensation issues

• Lower installation costs

8.How long does an HVAC copper line set last?

A high-quality copper line set can last 15–20 years or more, depending on installation quality and environmental conditions.