What's in the box
- 25 FT Copper Liquid Line (3/8")
- 25 FT Copper Suction Line (5/8")
- Factory-Flared Fittings (ready to connect)
- Protective Insulation
MODEL: MC25-3858
The MRCOOL® MC25-3858 25 FT Flared Line Set Kit is designed for 24,000 BTU MRCOOL® Ductless Mini Split Systems, providing a reliable and durable connection between your indoor and outdoor units.
Built from premium copper tubing and equipped with factory-flared fittings, this line set ensures secure installation and long-lasting performance. The 25-foot length provides extra flexibility for larger rooms or when your system requires extended reach.
This traditional flared-style line set is ideal for installers who want professional-grade precision when connecting MRCOOL® systems.
Why Choose This Line Set
✅ Perfect Match for 24K BTU Systems – engineered for larger rooms and zones
✅ 25 FT Extended Length – more installation flexibility
✅ Pre-Flared Connections – secure and professional-grade fit
✅ Durable Copper Tubing – built for long-term reliability
✅ Installer-Friendly – trusted performance in the field
| Feature | Details |
|---|---|
| Model | MC25-3858 |
| Line Set Length | 25 FT |
| Liquid Line Size | 3/8" |
| Suction Line Size | 5/8" |
| Line Set Type | Flared |
| Color | Copper |
| Weight | 17 lbs |
| Dimensions | 29" (D) × 28.5" (W) × 3.5" (H) |
| Warranty | N/A (covered under system) |
Questions, answered
Everything homeowners ask before buying a MRCOOL® system.
Installation
Do I need an HVAC technician to install this?
No. MRCOOL® DIY systems are designed for homeowner installation. The pre-charged Quick Connect® line set means there's no refrigerant handling, no vacuum pump, and no special tools or license required.
How long does installation take?
Most single-zone systems go in within a few hours: mount the indoor air handler, set the outdoor condenser, connect the pre-charged line set, and power it on.
Do I need an electrician?
The system needs a dedicated circuit. Most homeowners have a licensed electrician add the breaker and disconnect — everything else you can do yourself.
Sizing & compatibility
What BTU size do I need?
As a rule of thumb: up to 400 sq ft → 9–12K BTU, 400–600 sq ft → 12–18K, 600–1,000 sq ft → 18–24K. Use the room-size guide above and factor in insulation, ceiling height and sun exposure.
Will it heat in winter?
Yes — these are heat pumps, so they heat and cool. Many MRCOOL® systems keep heating in sub-freezing temperatures; check each model's spec sheet for its low-temperature heating range.
115V or 230V — which do I need?
9K–12K units are usually 115V (standard outlet circuit); 18K and larger are typically 230V. The voltage is shown in the product options and specifications.
Warranty & support
What warranty is included?
MRCOOL® systems carry manufacturer warranty coverage — typically 5–10 years on major components when you register your system after installation.
How do I get help choosing or installing?
Email support@coolheatdirect.com — our U.S. team replies within one business day with sizing, voltage and compatibility help.
Shipping & returns
How fast does it ship?
Most products ship in 3–5 business days with free curbside delivery in the continental U.S. The freight carrier calls to schedule your delivery.
Can I return it?
Returns are accepted within 30 days on new, unopened items in original packaging. A restocking fee may apply to HVAC equipment — we always confirm before issuing a return authorization.
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