MRCOOL® DIY 12K Hyper Heat Complete Mini-Split System – 5th Gen Wall Mount (230V)
Summary
The MRCOOL® DIY 12K Hyper Heat Complete Mini-Split System is a single-zone heating and cooling solution built for true DIY installation — no vacuum pumps, no gauges, no HVAC license, and no refrigerant handling required. This 5th Gen bundle delivers cold-climate performance with heating down to -22°F, making it ideal for bedrooms, garages, home offices, and ADUs up to 550 sq. ft.
Featuring the DIYHH-12-HP-C-230D25-O Hyper Heat condenser and DIY-12-HP-WMAH-230D25-O wall-mounted air handler, this system combines 23.5 SEER2 efficiency with professional-grade capabilities. The included 25 ft pre-charged QuickConnect® line set eliminates complex HVAC procedures, helping reduce typical installation labor costs. With Gold Fin® anti-corrosion coating, smart WiFi controls via the SmartHVAC™ app, and compatibility with Amazon Alexa and Google Assistant, this system delivers reliable comfort in harsh winter conditions.
Highlights
Up to 550 sq. ft.
208/230V
23.5
Down to -22°F
- True DIY installation: Pre-charged QuickConnect® line set requires no vacuum pump, gauges, or refrigerant handling.
- Smart controls: SmartHVAC™ app, wireless remote, Alexa, and Google Assistant.
- Gold Fin® protection: Anti-corrosion coating for long-term durability.
- Whisper-quiet indoor: Low sound levels for bedrooms and offices.
What's Included
- Outdoor Condenser: MRCOOL® DIY Hyper Heat 12K Condenser (DIYHH-12-HP-C-230D25-O)
- Indoor Air Handler: MRCOOL® 12K Wall-Mount Air Handler (DIY-12-HP-WMAH-230D25-O)
- Line Set: 25 ft Pre-Charged QuickConnect® Line Set
- DIYPRO® Communication Cable
- Wireless Remote Control
- Installation accessories & mounting hardware
- User manual and documentation
Warranty
- 7-Year Compressor Warranty
- 5-Year Parts Warranty
- Limited lifetime compressor replacement with MRCOOL® Care
Note: Warranty registration is required. Refer to MRCOOL warranty documentation for full terms and conditions.
Technical Information
Outdoor Model: DIYHH-12-HP-C-230D25-O
| Brand | MRCOOL |
| Series | DIY Hyper Heat 5th Gen |
| Model | DIYHH-12-HP-C-230D25-O |
| Unit Type | Mini-Split |
| Equipment Type | Condenser |
| Short Description | 12K Hyper Heat 230V Condenser with QuickConnect® |
| Cooling Capacity (BTU) | 12,000 |
| Heating Capacity (BTU) | 12,000 |
| SEER2 | 23.5 |
| HSPF2-4 | 10 |
| HSPF2-5 | 8 |
| EER2 | 12.8 |
| Voltage | 208/230 |
| Phase | 1 |
| Max Fuse / Breaker (A) | 15 |
| Min Circuit Ampacity (A) | 15 |
| Min Ambient Heat (°F) | -22°F |
| Min Ambient Cool (°F) | -22°F |
| Refrigerant Type | R-454B |
| Line Set Included | Yes |
| Line Set Length | 25 ft |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
| Decibel Rating High (dBA) | 56.5 |
| Color | White |
| Special Feature | Gold Fin® Anti-Corrosion Coating |
| Net Width (in) | 31.69 |
| Net Height (in) | 21.81 |
| Net Depth (in) | 12.99 |
| Net Weight (lbs) | 72.31 |
Indoor Model: DIY-12-HP-WMAH-230D25-O
| Brand | MRCOOL |
| Series | DIY 5th Gen |
| Model | DIY-12-HP-WMAH-230D25-O |
| Unit Type | Mini-Split |
| Equipment Type | Air Handler |
| Short Description | 12K 230V Wall Mount Air Handler |
| Cooling Capacity (BTU) | 12,000 |
| Heating Capacity (BTU) | 12,000 |
| Max Coverage Area | 550 sq. ft. |
| Mount Type | Wall |
| Voltage | 208/230 (powered from outdoor unit) |
| Min Circuit Ampacity (A) | 3 |
| Number of Speeds | 5 |
| Decibel Rating Low (dBA) | 19 |
| Decibel Rating High (dBA) | 54.5 |
| Operating Modes | Cool / Heat / Auto / Dry / Fan / Sleep |
| Filter Type | Reusable, Washable |
| WiFi Compatibility | Yes |
| App Compatibility | Yes (SmartHVAC™ App) |
| Works With iOS | Yes |
| Works With Android | Yes |
| Voice Control | Amazon Alexa & Google Assistant |
| Remote Control Included | Yes |
| Color | White |
Frequently Asked Questions
Do I need an HVAC technician to install this?
No. This is a true DIY system. The line set is factory-sealed and pre-charged, so no vacuum pump or gauges are required.
Can it heat effectively in very cold winters?
Yes. This Hyper Heat system is engineered to maintain performance down to -22°F.
What electrical supply is required?
A 208/230V, 15A dedicated circuit is required. This system does not work with standard 115V outlets.
Is the refrigerant included and pre-charged?
Yes. The 25 ft QuickConnect® line set is factory-charged with R-454B refrigerant. No additional charging is needed.
Can I control it with my phone?
Yes. The system is WiFi-enabled and works with the SmartHVAC™ app for iOS and Android.
