MRCOOL DIY Select 1st Gen R454B 12K BTU 115V White Wall Mount Air Handler DIYS-12-HP-WMAH-115A13-O
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The MRCOOL® DIY® Select 12K BTU 115V Ductless Mini-Split Heat Pump Air Handler delivers efficient, reliable heating and cooling for spaces up to 550 square feet. Ideal for attics, garages, home offices, and similar-sized rooms, this system provides consistent year-round comfort while helping lower energy use and utility costs.
As part of the MRCOOL® DIY® lineup, this unit is engineered for true do-it-yourself installation. The compatible Quick Connect® line set arrives factory pre-charged with environmentally friendly R-454B, eliminating the need for vacuum pumps or refrigerant handling. In addition, the 13-foot DIYPRO® cable removes the need for traditional electrical conduit, simplifying installation while protecting wiring from moisture, pests, and everyday wear.
Comfort control is easy and flexible with the included wireless remote or the MRCOOL® Comfort app, which lets you adjust temperatures, create schedules, and monitor energy usage from anywhere. Voice-control compatibility with Amazon Alexa and Google Assistant adds hands-free convenience.
Advanced features like Dry Mode, Sleep Mode, Auto Mode, and programmable scheduling enhance comfort while improving efficiency. A Gold Fin® condenser coating provides added corrosion resistance for long-term durability, even in humid or coastal environments.
The MRCOOL® DIY® Select 12K includes a 2-year compressor warranty and 1-year parts warranty.
Technical Specifications
| Coverage Area | 550 sq. ft. |
| Tonnage | 1 Ton |
| Voltage | 115V, 1-Phase, 60Hz |
| Max Fuse / Breaker | 15A |
| Min Circuit Ampacity | 3A |
| Refrigerant Type | R-454B |
| Liquid Line Size | 1/4 in |
| Suction Line Size | 3/8 in |
| Wi-Fi Compatible | Yes |
| App Compatible | Yes |
| Net Dimensions (D×H×W) | 7.87 × 11.61 × 31.57 in |
| Net Weight | 24.91 lbs |
| Gross Weight | 35.71 lbs |
Warranty
- 1 Year Parts Warranty
Product Documentation
- MRCOOL DIY Select 12K BTU 115V Air Handler Installation Manual (PDF)
- MRCOOL DIY Select 12K BTU 115V Air Handler Warranty Document (PDF)
- MRCOOL DIY Select Product Brochure (PDF)
- MRCOOL DIY Select 12K AHRI Certification (PDF)
- MRCOOL DIY Select 12K Energy Guide (PDF)
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.