MRCOOL
MRCOOL DIY Select 1st Gen - R454B - 12K BTU 115V Black Wall Mount Air handler + Condenser
1 Ton | SEER2 17.5 | R-454B | 115V
- 12000 BTU cooling capacity
- Up to 17.5 SEER2 rated efficiency
- Uses R-454B refrigerant
- Runs on 115V power
Key Specifications
Product Overview
MRCOOL DIY Select 1st Gen - R454B - 12K BTU 115V Black Wall Mount Air handler + Condenser.
What this system is
- DIYS-12-HP-C-115A11-O — DIY Select 1st Gen - R454B - 12K BTU 115V Condenser w/ 11ft Install Kit
- DIYS-12-HP-B-WMAH-115A13-O — DIY Select 1st Gen - R454B - 12K BTU 115V Black Wall Mounted Air Handler - with 13' Communication Cable
Outdoor condenser — DIYS-12-HP-C-115A11-O
The MRCOOL® DIY® Select 12K BTU 115V Ductless Heat Pump Single Zone Mini-Split Condenser is designed to make HVAC installation simple and accessible for homeowners. Built for true do-it-yourself installation, it requires no specialized tools, certifications, or prior HVAC experience. Ideal for garages, home offices, studios, and similar spaces, it delivers reliable heating and cooling for areas up to 550 square feet.
Despite its DIY®-friendly design, the system delivers strong performance with a 17.5 SEER2 cooling rating and 9 HSPF2-4 heating efficiency, providing consistent, energy-efficient comfort year-round while helping control utility costs.
Installation is further simplified with an 11.5-foot Quick Connect® line set that arrives factory pre-charged with environmentally friendly R-454B refrigerant, eliminating the need for vacuum pumps or refrigerant handling. Most components are included, making setup faster and more approachable for first-time installers.
Comfort control is easy using the included wireless remote or the MRCOOL® Comfort app, which allows remote temperature control, scheduling, and energy monitoring. Compatibility with Amazon Alexa and Google Assistant adds hands-free convenience.
Features like Sleep Mode, Dry Mode, Auto, and a Gold Fin® condenser coating enhance comfort and durability, even in humid or coastal environments.
MRCOOL® offers enhanced peace of mind with their 2-year compressor warranty and 1-year parts warranty for homeowners.
| Model number | DIYS-12-HP-C-115A11-O |
|---|---|
| UPC | 840255595674 |
| Series | DIY Select |
| Unit type | Mini-Split |
| Equipment type | Condenser |
| Refrigerant | R-454B |
| Refrigerant charge (oz) | 21.52 |
| Nominal tonnage | 1 |
| Cooling capacity (BTU/h) | 12000 |
| Heating capacity (BTU/h) | 12000 |
| SEER2 | 17.5 |
| EER2 | 8.5 |
| HSPF2 (region IV) | 9 |
| HSPF2 (region V) | 6.8 |
| Voltage | 115 |
| Phase | 1 |
| Cycle (Hz) | 60 |
| Min circuit ampacity (A) | 19.5 |
| Max fuse / breaker (A) | 20 |
| Compressor type | Rotary |
| Inverter | Yes |
| Metering device | EEV |
| Liquid line size (in) | 1/4 |
| Suction line size (in) | 3/8 |
| Line set included (ft) | 11.5 ft. |
| Max line set length (ft) | 75 ft. |
| Sound level (dBA) | 54 |
| Colour | White |
| AHRI certified | Yes |
| ENERGY STAR certified | No |
| UL listed | Yes |
| ETL listed | Yes |
| Parts warranty (years) | 1 Year Parts |
| Compressor warranty (yrs) | 2 Years Compressor |
| Net W x H x D (in) | 28.35 x 19.49 x 10.63 |
| Net weight (lbs) | 54.89 |
| Shipping W x H x D (in) | 36.22 x 27.36 x 16.54 |
| Shipping weight (lbs) | 67.24 |
Indoor unit — DIYS-12-HP-B-WMAH-115A13-O
The MRCOOL® DIY® Select 12K BTU 115V Ductless Mini-Split Heat Pump Air Handler in black delivers powerful, energy-efficient heating and cooling for spaces up to 550 square feet. Its sleek, modern design blends easily into a variety of interiors, making it an excellent choice for attics, garages, home offices, and similar spaces. Built for year-round comfort, it maintains consistent temperatures while helping reduce energy consumption and overall utility costs.
As part of the MRCOOL® DIY® lineup, this system is engineered for true do-it-yourself installation. It pairs with Quick Connect® line sets that come factory pre-charged with R-454B refrigerant, eliminating the need for vacuum pumps, specialized tools, or refrigerant handling to streamline installation.
The included 13-foot DIYPRO® cable further enhances installation by eliminating the need for electrical conduit while protecting wiring from moisture, pests, and outdoor exposure. This added durability helps ensure long-term reliability and a clean, professional-looking setup.
Comfort control is simple and flexible with the included wireless remote or the MRCOOL® Comfort app. Users can adjust temperatures, set schedules, and monitor energy usage from anywhere, while compatibility with Amazon Alexa and Google Assistant allows for convenient voice control.
Additional features like Dry Mode, Sleep Mode, Auto Mode, and programmable scheduling help maintain a balanced indoor environment while optimizing efficiency. The system is designed for lasting performance. Backed by a 2-year compressor and 1-year parts warranty, it offers a dependable, cost-effective comfort solution.
| Model number | DIYS-12-HP-B-WMAH-115A13-O |
|---|---|
| UPC | 840433619925 |
| Series | DIY Select |
| Unit type | Mini-Split |
| Equipment type | Air Handler |
| Refrigerant | R-454B |
| Nominal tonnage | 1 |
| Airflow (CFM) | 353.2 / 294.3 / 235.4 / 176.6 / 129.5 |
| Voltage | 115 |
| Phase | 1 |
| Cycle (Hz) | 60 |
| Min circuit ampacity (A) | 3 |
| Max fuse / breaker (A) | 15 |
| Blower motor type | DC |
| Liquid line size (in) | 1/4 |
| Suction line size (in) | 3/8 |
| Filter type | Reusable |
| Max coverage area | 550 sq. ft. |
| Sound level low (dBA) | 17.5 |
| Sound level high (dBA) | 44.5 |
| Colour | Black |
| Wi-Fi capable | Yes |
| Remote included | Yes |
| Parts warranty (years) | 1 Year Parts |
| Net W x H x D (in) | 31.57 x 11.61 x 7.87 |
| Net weight (lbs) | 24.91 |
| Shipping W x H x D (in) | 36.02 x 16.34 x 13.97 |
| Shipping weight (lbs) | 35.71 |
Documents
- Installation manual (DIYS-12-HP-C-115A11-O) (PDF)
- Service manual (DIYS-12-HP-C-115A11-O) (PDF)
- Remote manual (DIYS-12-HP-C-115A11-O) (PDF)
- Brochure (DIYS-12-HP-C-115A11-O) (PDF)
- Warranty (DIYS-12-HP-C-115A11-O) (PDF)
- AHRI certificate (DIYS-12-HP-C-115A11-O) (PDF)
- EnergyGuide label (DIYS-12-HP-C-115A11-O) (PDF)
WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.
Technical Specifications
Performance
| System Type | Mini-Split |
|---|---|
| Capacity | 12000 BTU |
| Tonnage | 1 Ton |
| SEER2 | 17.5 |
| EER2 | 8.5 |
| HSPF2 | 9 |
Electrical & Fuel
| Voltage | 115V |
|---|---|
| Phase | Single Phase |
| Refrigerant | R-454B |
Shipping & Delivery
Installation video
Published by MRCOOL. Watch the full walkthrough before you start, and follow the installation manual for this model — the video is a guide, not a substitute for it.
Manufacturer Warranty
Covered by MRCOOL's limited warranty. Warranty terms are set by MRCOOL and differ by product line — whether registration is required, and whether the installation has to be performed by a state-licensed HVAC contractor, is not the same across the range. In every case coverage depends on the unit being installed according to MRCOOL's instructions and all applicable codes and permits. MRCOOL's warranty document for this model is the controlling source; ask us and we'll send you the one that applies.
Professional Installation Recommended
Most HVAC equipment must be installed and connected by a licensed professional to remain safe, code-compliant, and eligible for manufacturer warranty coverage. If you're unsure about installation requirements, contact us before you order.
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