Description
Why Choose the MRCOOL DIY Line Set 25 ft?
The MRCOOL DIY Line Set 25 ft (R-410A) is a pre-charged, quick-connect refrigerant line set designed specifically for MRCOOL DIY 4th Generation mini-split systems. This 25-foot line set includes the refrigerant lines, communication cable, and drain line — everything you need to connect your indoor air handler to the outdoor condenser unit without the need for a licensed refrigerant technician. The pre-charged design means the refrigerant is already inside the lines, sealed with quick-connect fittings that snap together in minutes. This is the same line set included with MRCOOL DIY Complete System bundles, sold separately for replacement or extension purposes.
About the MRCOOL DIY Line Set 25 ft (R-410A)
The MRCOOL DIY Line Set features 3/8 x 5/8 inch copper refrigerant lines insulated with closed-cell foam for maximum efficiency. The pre-charged quick-connect fittings eliminate the need for a manifold gauge set, vacuum pump, or refrigerant handling certification. The 25-foot length is ideal for installations where the indoor unit is mounted on an exterior wall and the outdoor condenser is placed on the ground or a wall bracket nearby. Compatible with MRCOOL DIY 4th Generation 18K, 24K, and 36K BTU systems using R-410A refrigerant.
? Technical Specifications
| Specification | Value |
|---|---|
| Brand | MRCOOL |
| SKU | DIY-LS-25 |
| Series | DIY Line Set |
| Length | 25 ft |
| Line Size | 3/8 x 5/8 inch |
| Refrigerant | R-410A (pre-charged) |
| Connection Type | Quick-connect (no tools required) |
| Includes | Refrigerant lines, communication cable, drain line |
| Compatible Systems | MRCOOL DIY 4th Gen 18K, 24K, 36K BTU |
| Weight | 3.5 lbs (1.6 kg) |
? Pro Installation & Usage Tips
- This line set is pre-charged with R-410A refrigerant — do not cut or modify the lines.
- Ensure the quick-connect fittings are fully seated and locked before powering on the system.
- Route the line set through the wall using the included drain line to prevent condensate issues.
- This 25 ft line set is compatible with MRCOOL DIY 4th Gen systems only — not compatible with 5th Gen R-454B systems.
- For runs longer than 25 ft, use the MRCOOL DIY Line Set Extension Kit.
❓ Frequently Asked Questions
Yes. The MRCOOL DIY Line Set 25 ft comes pre-charged with R-410A refrigerant. The quick-connect fittings are factory-sealed and require no additional refrigerant charging.
This line set is compatible with MRCOOL DIY 4th Generation mini-split systems (18K, 24K, and 36K BTU models) that use R-410A refrigerant. It is NOT compatible with MRCOOL DIY 5th Generation systems, which use R-454B refrigerant and different line set sizes.
No. The pre-charged quick-connect design allows homeowners to install this line set without a refrigerant handling certification. Simply connect the fittings and the system is ready to run.
Yes, using the MRCOOL DIY Line Set Extension Kit. However, extending the line set may affect system performance and warranty coverage. Consult the installation manual for maximum line set length recommendations.
The MRCOOL DIY Line Set is covered by MRCOOL's standard 5-year parts warranty. Register your product within 30 days of installation to activate the warranty.
? Warranty & Registration
| ? Parts Warranty | 5-year (registered) |
| ⚙ Registration | Register within 30 days of installation |
| ✅ Refrigerant | R-410A (pre-charged, no additional charging required) |
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