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.
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We will prepare your order within 24 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION: Please be kindly informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery. To AVOID delays, please check if the provided phone number in the order details is a current number where you can be reached. You can also contact the carrier directly and refer to your tracking number to set up a date and time for your appointment. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. PLEASE verify your shipping address, as changes to the address after freight has shipped can result in an additional 15% or higher fee depending on freight weight and dimensions.
SMALLWARES INFORMATION: Please be informed that for smaller items, such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves, when these items are ordered individually, they may be shipped via FedEx without a signature requirement. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING: Please inspect your boxes thoroughly when you receive them. They should arrive shrink-wrapped and on a pallet. If you notice any damages or imperfections (e.g. crushed box or forklift hole), please write comments on the receipt before signing for delivery, no matter how small damages seem. Contact us immediately to assist you.
Shipping & Delivery
We will prepare your order within 24–48 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION
Please be informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery.
To AVOID delays, please make sure the phone number in your order details is accurate and one where you can be reached. You may also contact the carrier directly using your tracking number to schedule your delivery.
It is your responsibility to ensure a safe and secure delivery environment. We are not liable for any packages that are stolen or lost after delivery is confirmed.
Please verify your shipping address carefully. Changes to your shipping address after the freight has been shipped may result in additional fees of 15% or more, depending on freight weight and dimensions.
SMALLWARES INFORMATION
Smaller items such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves may be shipped via FedEx without a signature requirement if ordered individually.
It is your responsibility to ensure a safe delivery location. We are not liable for packages lost or stolen after delivery confirmation. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING
Please inspect your boxes carefully upon delivery. Shipments should arrive shrink-wrapped and on a pallet. If you notice any damage or signs of mishandling (such as a crushed box or forklift puncture), write comments on the delivery receipt before signing, even if the damage appears minor.
Contact us immediately if any issues arise so we can assist you promptly.
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