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MRCOOL

MRCOOL DIY Select 1st Gen - R454B - 12K BTU 115V Black Wall Mounted Air Handler - with 13' Communication Cable

DIYS-12-HP-B-WMAH-115A13-O

12,000 BTU · 115V · R-454B

Part of DIY Select – Air Handlers

Cooling capacity
12,000 BTU1 ton
Room size
550 sq ft
Power
115V15A breaker
Refrigerant
R-454B
Install
DIYPre-charged, no vacuum

$399.04 each

Not sure about the size? Use the BTU sizing calculator, or call us and we'll size it with you. This is a DIY system: the pre-charged line set connects without a vacuum pump or gauges.

Build a multi-zone system with this air handler →

Distributor pricing and stock: call 678-467-5515 or email sales@discountkings.net.

About this product

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.

Documents & manuals

Specifications

Capacity & efficiency
TypeAir handler (indoor unit) — heat pump (heats & cools)
SeriesDIY Select
Cooling capacity12,000 BTU
Nominal size1 ton
ZonesSingle zone
Coverage550 sq. ft.
Airflow353.2 / 294.3 / 235.4 / 176.6 / 129.5 CFM
Sound level17.5–44.5 dBA
Electrical
Voltage115V
Phase1-phase
Min. circuit ampacity (MCA)3 A
Max. breaker (MOP)15 A
Wi-Fi / app controlYes
Refrigerant & line set
RefrigerantR-454B
Liquid line1/4"
Suction line3/8"
InstallationDIY — pre-charged quick-connect line set, no vacuum pump needed
Physical
Dimensions (in)31.57 W × 7.87 D × 11.61 H
Weight24.91 lb
Shipping weight35.71 lb
ColorBlack
Certifications, warranty & ordering
Parts warranty1 years
UPC840433619925