What's in the box
- 1 × MRCOOL® DIY® 24K 5th Gen Condenser — DIY-24-HP-C-230D25-O
- 1 × MRCOOL® DIY® 24K 5th Gen Air Handler — DIY-24-HP-WMAH-230D25-O
- 1 × 25 ft Quick Connect® Line Set, 3/8" × 5/8"
- 1 × MRCOOL® Remote Control
- 1 × DIYPRO® Cable
- Installation documentation
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Designed for simplified installation using MRCOOL® Quick Connect® technology.
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Local electrical requirements and building codes may vary.
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Professional electrical work may still be recommended depending on local regulations and installation requirements.
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Always review the installation manual 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-24-HP-WM-230D25-O
Premium Comfort. Bigger Spaces. DIY Simple.
The MRCOOL® DIY® 5th Gen 24K BTU Single-Zone Mini-Split System (230V) delivers powerful, energy-efficient heating and cooling for spaces up to approximately 1,050 sq ft — all in one complete system designed for dependable year-round comfort.
Ideal for larger living areas, open-plan spaces, basements, garages, large bedrooms, studios, and spacious rooms, this system combines strong performance, smart control, and simplified installation in one premium comfort solution built for bigger spaces.
The system includes a wall-mounted indoor air handler, outdoor condenser, 25 ft Quick Connect® pre-charged line set with R-454B refrigerant, and DIYPRO® cable.
Control your comfort from anywhere using the SmartHVAC app on Apple or Android devices, or enjoy hands-free voice control with Amazon Alexa and Google Assistant.
Why You’ll Love It
✅ Ideal for spaces up to ~ 1050 sq ft
✅ Powerful heating & cooling in one complete system
✅ Smart app control with Alexa & Google Assistant
✅ Quiet performance for larger living areas
✅ 25 ft Quick Connect® pre-charged line set included
✅ Energy-efficient DC inverter technology
✅Gold Fin® coating for added durability and corrosion resistance
Best For
Living Rooms • Open-Plan Spaces • Basements • Garages • Large Bedrooms • Studios & Large Rooms
Need More Heating & Cooling Power?
Explore larger systems for bigger spaces or higher heating and cooling demands:
- 36K BTU Systems
- Multi-Zone Systems
- Central Ducted Systems
| Specification | Details |
|---|---|
| Coverage Area | Up to 1,050 sq ft |
| Cooling Capacity | 24,000 BTU |
| Heating Capacity | 24,000 BTU |
| Voltage | 208/230V |
| Zone Type | Single Zone |
| SEER2 | 22.7 |
| EER2 | 12.7 |
| HSPF2-4 | 9.5 |
| HSPF2-5 | 7.1 |
| Indoor Sound Level | 20–54 dB(A) |
| Outdoor Sound Level | 58.5 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 | 164 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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