What's in the box
- 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
- Designed for simplified installation using MRCOOL® QuickConnect® technology
- DIY-friendly system with pre-charged Quick Connect® line set
- Local electrical requirements and building codes may vary
- Professional electrical work may still be required in some locations
- Review all installation documentation before purchase and installation
- 7-Year Compressor Warranty
- 5-Year Parts Warranty
Please refer to the Warranty Document above for full coverage details, terms, and registration requirements.
- Free U.S. curbside delivery within the Lower 48 States on qualifying orders
- Orders ship from U.S. warehouses
- Delivery times may vary by location and carrier availability
- Returns accepted within 30 days for unused and uninstalled products
- Approved returns may be subject to a restocking fee
Manuals & documents
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
Need More Heating & Cooling Power?
Explore larger systems for bigger spaces or higher heating and cooling demands:
| Coverage Area | Up to 1,550 sq ft |
| Cooling Capacity | 36,000 BTU |
| Heating Capacity | 36,000 BTU |
| Voltage | 208/230V |
| Zone Type | Single Zone |
| SEER2 | 18 |
| EER2 | 8.5 |
| HSPF2-4 | 8.5 |
| HSPF2-5 | 6.5 |
| Indoor Sound Level | 27.5–55.5 dB(A) |
| Outdoor Sound Level | 60.5 dB(A) |
| WiFi Compatible | Yes |
| Voice Assistant | Alexa® & Google Assistant® |
| Inverter Technology | DC Inverter |
| Refrigerant | R-454B |
| Line Set Length | 25 ft |
| Max Line Set Length | 213.2 ft |
| Line Sizes | 3/8" Liquid / 5/8" Suction |
| Compressor Type | Rotary |
| Certifications | AHRI, UL, ETL |
| Warranty | 7-Year Compressor / 5-Year Parts |
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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