What's in the box
- 25 FT Copper Liquid Line (1/4")
- 25 FT Copper Suction Line (1/2")
- Factory-Flared Fittings (ready to connect)
- Protective Insulation
MODEL: MC25-1412
The MRCOOL® 25 FT Flared Line Set Kit (MC25-1412) is designed for 12K and 18K MRCOOL® Ductless Mini Split Systems, providing a secure, professional-grade connection between the indoor and outdoor units.
Constructed from durable copper tubing with pre-flared fittings, this line set ensures easy installation and reliable performance. Its 25-foot length provides additional reach and flexibility, making it ideal for setups where indoor and outdoor units are farther apart.
Unlike No-Vac® pre-charged line sets, the MC-series uses traditional flared connections, making it perfect for HVAC professionals and installers who prefer more control over the installation process.
Why Choose This Line Set
✅ 25 FT Copper Line Set – more flexibility for extended installs
✅ Flared Fittings – pre-flared for accurate, secure connections
✅ Compatible with 12K & 18K Units – engineered for smaller-to-mid rooms
✅ Durable Construction – heavy-duty copper with protective insulation
✅ Installer-Friendly – reliable performance for long-term use
| Feature | Details |
|---|---|
| Model | MC25-1412 |
| Line Set Length | 25 FT |
| Liquid Line Size | 1/4" |
| Suction Line Size | 1/2" |
| 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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