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DBJ-003
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DABUND
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Copper
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1M - 50M
Material
Color
Keywords
Application
75 ft 3/8" x 5/8" Mini Split Long Line Set
The 75 ft 3/8" x 5/8" mini split long line set is an extended HVAC line set designed for ductless mini split air conditioners, heat pumps and long-distance indoor-to-outdoor unit installations.
This long line set includes pre-insulated 3/8" liquid and 5/8" suction copper lines, helping maintain stable refrigerant flow, reduce heat gain, prevent condensation and support reliable HVAC performance over longer line runs.
Dabund supplies mini split line sets, insulated copper tubing, long HVAC line sets and refrigeration copper pipe for contractors, distributors, wholesalers, importers and OEM private-label buyers.
Product Overview: Extended Line Set for Long-Reach Mini Split Installations
The 75 ft 3/8" x 5/8" mini split long line set is engineered for HVAC installations where extra distance is required between indoor and outdoor units.
It is suitable for second-story installations, multi-room layouts, rooftop condenser placement, balcony installations and long horizontal line runs where standard 25 ft or 50 ft line sets may not be enough.
Key Features of 75 ft 3/8" x 5/8" Mini Split Long Line Set
75 ft extended HVAC line set for long-distance mini split and heat pump installations.
3/8" liquid line and 5/8" suction line for compatible ductless HVAC systems.
99.9% pure copper tubing supports stable refrigerant flow and long service life.
Factory-applied insulation helps reduce heat gain, heat loss and surface condensation.
Long continuous line set reduces the need for multiple couplings and potential leak points.
UV-resistant insulation supports indoor and outdoor HVAC line runs.
Suitable for R410A, R32 and similar HVAC refrigerants when installed correctly.
Available for OEM logo printing, custom length, insulation thickness and export packaging.
Long 75 ft Length for Flexible HVAC Layouts
Extended Indoor-to-Outdoor Unit Distance
The 75 ft length gives installers more flexibility when the outdoor condenser must be placed far from the indoor unit due to building structure, appearance, noise control or space limitations.
Fewer Couplings and Lower Leak Risk
A single continuous long line set helps reduce the number of coupling points, which can lower the risk of refrigerant leaks and simplify long-run installation.
Better for Multi-Floor and Rooftop Installations
This extended line set is suitable for multi-story buildings, rooftop units, long horizontal routes and installations where short line sets cannot reach the required condenser location.
Standard 3/8" x 5/8" Line Set Size
3/8" Liquid Line
The 3/8" copper line is commonly used as the liquid line in compatible mini split, heat pump and HVAC systems.
5/8" Suction Line
The 5/8" copper line is commonly used as the suction line, helping return refrigerant vapor from the indoor unit to the outdoor compressor.
Common HVAC Capacity Range
The 3/8" x 5/8" line set is commonly used for 3.0 ton to 4.0 ton ductless mini split systems and many 36,000 BTU to 48,000 BTU applications. Final sizing must follow the HVAC equipment manufacturer’s installation manual.
High-Quality Insulated Copper Tubing
99.9% Pure Copper for Thermal Conductivity
The copper tubing is made from high-purity copper to support strong thermal conductivity, pressure resistance, corrosion resistance and reliable refrigerant transfer.
Factory-Applied Insulation for Energy Efficiency
Closed-cell insulation helps minimize heat gain and heat loss over long distances, reducing condensation and supporting stable system operation.
UV-Resistant Insulation for Outdoor Exposure
The insulation jacket is designed for indoor and outdoor use, helping protect the line set from sunlight, moisture and weather variation.
Compatibility and HVAC Applications
Ductless mini split air conditioners.
Ductless heat pump systems.
Residential HVAC installations.
Light commercial air conditioning systems.
Second-floor and multi-story building installations.
Rooftop or long-distance condenser placement.
Extended HVAC refrigerant line replacement projects.
This long line set can support common refrigerants such as R410A, R32 and other HVAC refrigerants when the copper tubing, insulation, pressure rating and installation method match system requirements.
99.9% Pure Copper
White PE Insulated Pipe
Plastic Cap Protection
Pipe Insulation Tubing Structure
The white PE insulation structure helps protect the copper tubing from heat transfer, moisture condensation, sunlight exposure and installation wear during long HVAC line runs.
Embossed White PE Outer Layer
The outer layer helps resist aging, abrasion and sunlight exposure while keeping the line set appearance clean after installation.
Closed-Cell Foam Insulation
Closed-cell insulation helps reduce heat transfer, water penetration and condensation on refrigerant lines.
Inner Protective Layer
The inner protective layer helps preserve copper pipe surface condition and maintain insulation performance across the full 75 ft line run.
Thermal Insulation Pipe Production
Insulation Pipe Warehouse
Inner Layer Insulated Pipe
Key Benefits of a 75 ft Mini Split Long Line Set
Fewer Couplings and Lower Leak Risk
A single continuous 75 ft line set reduces the need for multiple couplings, lowering potential refrigerant leak points and simplifying maintenance.
Cleaner Aesthetic and Professional Finish
Continuous insulated copper tubing creates a cleaner and more professional line route compared with spliced line sets.
Preferred for Large-Scale Installations
This 75 ft long line set is a practical option for larger homes, multi-floor buildings and installations requiring longer distance between the indoor and outdoor units.
Technical Specifications
| Specification | Detail |
| Product Name | 75 ft 3/8" x 5/8" Mini Split Long Line Set |
| Length | 75 ft / approx. 22.86 m |
| Line Set Size | 3/8" x 5/8" |
| Metric Size | 9.52 mm x 15.88 mm |
| Common Function | 3/8" liquid line and 5/8" suction line |
| Material | 99.9% pure copper tubing |
| Insulation | Factory-applied closed-cell UV-resistant insulation |
| Application | Extended mini split, ductless AC and heat pump systems |
| Customization | Length, insulation thickness, logo printing and export packaging available |
Installation Tips for Long Line Sets
Verify Manufacturer Maximum Line Length
Always check the mini split manufacturer’s specifications for maximum allowable line length, vertical lift, refrigerant charge adjustment and warranty compliance.
Maintain Proper Line Routing and Support
Plan the route to avoid sharp bends and secure the line set with suitable brackets, clips or line set covers to minimize vibration, sagging and strain.
Protect Insulation at Wall Penetrations
Use wall sleeves, grommets or protective covers at wall entry points to prevent insulation damage and create a tidy installation finish.
Perform Professional Leak Testing
Long line set installations should be properly flared, torqued, pressure-tested, evacuated and charged according to the HVAC equipment manufacturer’s requirements.
75 ft 3/8" x 5/8" Mini Split Long Line Set for HVACR Wholesalers
Dabund Pipe in-house tested insulated copper pipe and tubing is designed to make installation simple and quick, helping contractors save time and reduce cost on each job.
For distributors and private-label HVAC brands, Dabund supports long line set supply, custom insulation thickness, printed company name, size marking and export packaging.
Mini Split Line Set Size Options
| Size | Length | Insulation White PE | Flame Resistant |
| 1/4 + 3/8 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/4 + 1/2 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/4 + 5/8 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 5/8 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 3/4 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 1/2 + 3/4 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
| 3/8 + 7/8 | 15 m / 20 m / 25 m / 30 m / 50 m | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm | M1 / B1 |
Recommended Applications by AC Capacity
| Line Set Size | Common AC Capacity | Typical BTU Range | Typical Application |
| 1/4 + 3/8 | 0.75 ton - 1.0 ton | 9,000 BTU - 12,000 BTU | Small mini split air conditioner |
| 1/4 + 1/2 | 1.5 ton - 2.0 ton | 12,000 BTU - 18,000 BTU | Residential mini split system |
| 1/4 + 5/8 | 2.0 ton - 2.5 ton | 24,000 BTU - 30,000 BTU | Split air conditioner system |
| 3/8 + 5/8 | 3.0 ton - 4.0 ton | 36,000 BTU - 48,000 BTU | Ductless mini split and heat pump |
| 3/8 + 3/4 | 4.5 ton - 6.0 ton | 54,000 BTU - 72,000 BTU | Larger split AC installation |
| 3/8 + 7/8 | 6.0 ton - 8.0 ton | 72,000 BTU - 96,000 BTU | Commercial ductless HVAC systems |
Why Choose This 75 ft Mini Split Long Line Set?
Built for Extended-Reach Installations
With premium copper, durable insulation and extended length, this long line set supports consistent HVAC performance across longer distances.
Professional-Grade Copper and Insulation
99.9% pure copper tubing and factory-applied insulation help provide stable refrigerant flow, thermal efficiency and long-term installation reliability.
OEM and Bulk Supply Available
Dabund supports customized line length, insulation thickness, product printing, logo marking, package design and bulk export supply.
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, meeting ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.
Exhibition
Dabund joins HVAC exhibitions worldwide to present mini split line set and long HVAC line set products to customers face to face.
FAQ
What is a 75 ft mini split long line set used for?
It is used to connect indoor and outdoor units when a longer refrigerant line distance is required in mini split AC, heat pump and ductless HVAC installations.
What does 3/8" x 5/8" refer to?
It refers to the outer diameters of the refrigerant lines: 3/8" for the liquid line and 5/8" for the suction line.
When should I choose a 75 ft long line set?
Choose a 75 ft long line set when the distance between indoor and outdoor units exceeds standard shorter lengths, such as 25 ft, 35 ft or 50 ft.
Is this line set suitable for second-floor installations?
Yes. It is suitable for many second-floor, rooftop, balcony and long horizontal installations when the equipment manufacturer allows the line length.
Does this long line set require extra insulation in the field?
In most standard installations, the factory-applied insulation is sufficient. Additional field insulation may be needed when required by local codes or harsh environments.
Is this long line set compatible with R410A and R32?
Yes. It can work with common refrigerants such as R410A and R32 when the copper tubing, pressure rating and installation method match the HVAC system requirements.
Can the 75 ft line set be cut shorter?
Yes. Copper line sets can be cut to the required length. Proper cutting, deburring, flaring, torque control, evacuation and leak testing are required.
What AC capacity is 3/8" x 5/8" commonly used for?
The 3/8" x 5/8" line set is commonly used for 3.0 ton to 4.0 ton systems and many 36,000 BTU to 48,000 BTU applications.
Can Dabund customize long line sets?
Yes. Dabund can customize line length, insulation thickness, insulation material, product printing, logo marking and export packaging for OEM and wholesale buyers.
Are you a trading company or manufacturer?
Dabund is a manufacturer of mini split line sets, insulated copper pipe, aluminum pipe and HVAC installation parts.
Can I get a free sample?
Yes. Dabund can provide qualified customers with 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?
Yes. Dabund accepts OEM and ODM orders, including logo printing, brand marking, size printing, meter marking and customized 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 according to factory schedule.
