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-36-HP-WM-230D25-O
Powerful. Smart. Efficient.
The New Generation of Home Comfort Has Arrived.
Still dealing with a room that's too hot in summer, too cold in winter, or simply impossible to keep comfortable?
The MRCOOL® DIY® 5th Gen 36K BTU Mini-Split System was built for homeowners who need serious heating and cooling power for spaces up to 1,550 sq ft — without the cost, delays, and complexity of traditional HVAC installation.
Whether you're transforming a garage into usable space, cooling an open-concept living area, finishing a basement, upgrading a workshop, or creating year-round comfort in a guest house, this system delivers the power needed to keep temperatures comfortable when it matters most.
As part of the new 5th Generation MRCOOL® DIY® lineup, it features next-generation R-454B refrigerant, advanced DC inverter technology, and MRCOOL's QuickConnect® installation system, helping homeowners enjoy professional-level comfort with a simplified installation experience.
Stay in control from anywhere with the SmartHVAC® app, the included remote, or hands-free voice control through Amazon Alexa® and Google Assistant®.
With Follow Me® technology, Dry Mode humidity control, Gold Fin® corrosion protection, and reliable year-round heating and cooling, this isn't just another mini split.
It's a smarter way to make a large space comfortable.
Why You'll Love It
✅ Ideal for spaces up to ~1,550 sq ft
✅ Powerful heating & cooling in one complete system
✅ Smart app control with Alexa® & Google Assistant®
✅ Perfect for large living areas and open spaces
✅ 25 ft Quick Connect® pre-charged line set included
✅ DIY-friendly installation with DIYPRO® cable
✅ Energy-efficient DC inverter technology
✅ Gold Fin® coating for added durability and corrosion resistance
Best For
Large Living Rooms • Open-Concept Spaces • Finished Basements • Garages • Workshops • Studios • Guest Houses • Bonus Rooms
What's Included
- 1 × MRCOOL® DIY® 36K 5th Gen Condenser — DIY-36-HP-C-230D25-O
1 × MRCOOL® DIY® 36K 5th Gen Air Handler — DIY-36-HP-WMAH-230D25-O
1 × 25 ft Quick Connect® Line Set
1 × DIYPRO® Cable
1 × MRCOOL® Remote Control
Installation Documentation
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.
-
Genuine MRCOOL® Systems -
DIY-Friendly Installation -
U.S. Shipping -
Secure Checkout -
Sizing Help
