What's in the box
- MRCOOL® 12K DIY® 5th Gen Mini-Split Condenser (115V)
- 25ft DIYPro™ Communication Cable
- Installation Accessories
- MRCOOL® Warranty Documents
Free curbside shipping on eligible MRCOOL® systems across the continental U.S. Most products ship in 3–5 business days and arrive in 4–10 days, depending on your location. Freight carriers will call to schedule delivery.
Returns accepted within 30 days on new, unopened items in original packaging. A restocking fee of up to 35% may apply for HVAC equipment — we’ll always confirm before issuing a return authorization.
Each MRCOOL® system is backed by manufacturer warranty coverage as defined by product and model — typically 5–10 years on major components. Register your system after installation to activate full coverage.
Need help with sizing, voltage or compatibility? Email support@coolheatdirect.com — our U.S. team replies within one business day.
MODEL: DIY-12-HP-C-115D25-O
Effortless, Energy-Efficient Climate Control for Spaces up to 500 sq. ft.
The MRCOOL® 12K BTU DIY® 5th Generation Mini-Split Condenser brings powerful, reliable heating and cooling to your home — no HVAC pro required. Designed for true DIY installation, this ductless heat pump is perfect for bedrooms, small living areas, home offices, and workshops up to 500 sq. ft.
Thanks to the pre-charged 25-foot Quick Connect® line set with eco-friendly R-454B refrigerant, installation is fast, clean, and vacuum-free. The included DIYPro™ cable offers added protection against weather, wildlife, and yard debris, ensuring lasting durability.
Enjoy seamless control through the SmartHVAC® app, or hands-free convenience with Amazon Alexa and Google Assistant. The Gold Fin® condenser coating protects against corrosion, making this unit an excellent choice for coastal or humid regions.
Built-in features like Auto Mode, Timer Function, and Auto Restart maximize energy savings, while the Anti-Mildew function keeps your air handler clean and healthy. Backed by an industry-leading warranty, you’ll enjoy efficient, year-round comfort with complete peace of mind.
Why You’ll Love It
✅ Ideal for Small to Medium Spaces — Perfect for bedrooms, home offices, and studios up to 500 sq. ft.
✅ True DIY Installation — No vacuum pumps or pro tools needed with the pre-charged Quick Connect® line set and DIYPro™ communication cable
✅ Smart-Home Ready — Control via the SmartHVAC® app, Alexa, and Google Assistant
✅ Gold Fin® Corrosion Protection — Rust-resistant, perfect for coastal climates
✅ Eco-Friendly Refrigerant — Uses R-454B, a greener, more efficient option
✅ Ultra-Quiet Operation — Operates at a whisper-quiet 54 dBA
✅ Industry-Leading Warranty — Limited Lifetime Compressor Warranty (with registration), 7-Year Compressor Warranty, and 5-Year Parts Warranty
What’s Included:
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MRCOOL® 12K DIY® 5th Gen Mini-Split Condenser (115V)
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25ft DIYPro™ Communication Cable
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Installation Accessories
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MRCOOL® Warranty Documents
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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