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MRCOOL DIY Select 12,000 BTU Ductless Mini Split Heat Pump 115V

SKU: mr18927k  |  Model: DIYS-12-HP-115A11-O
$1,399.00

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Manufacturer's Warranty

1-Year Parts Limited Warranty; 2-Year Compressor Limited Warranty

What's In The Box?
  • MRCOOL DIY Select 12,000 BTU Ductless Mini Split Indoor Air Handler (DIYS-12-HP-WMAH-115A13-O)
  • MRCOOL DIY Select 12,000 BTU Ductless Mini Split Outdoor Condenser (DIYS-12-HP-C-115A11-O)
  • 13-Foot Communication Cable
  • 11.5-Foot Installation Kit
  • Remote Control
  • Drain Hose
  • Air Filter
  • Installation Hardware
  • Owner's Manual, Guides, and Other Documents

Info & Guides

The MRCOOL DIY Select 12,000 BTU Ductless Mini-Split Heat Pump brings both heating and cooling to rooms up to 550 square feet, all from a single wall-mounted system you can install yourself. Built for homeowners who want climate control without coordinating with an HVAC contractor, this DIY Select system handles every season from one indoor air handler.

From bedrooms and home offices to detached garages, workshops, and grow rooms, this heat pump fits wherever you need single-zone climate control. The pre-charged 11.5-foot line set with R-454B refrigerant takes the most complex step out of installation, so you can complete the setup on your own schedule.

Key Features and Benefits of the MRCOOL DIY Select 12,000 BTU Heat Pump

  • Heating and Cooling: Delivers 12,000 BTU in both heating and cooling modes, so you can maintain comfort in a single zone across all 4 seasons.
  • Inverter Compressor: Variable-speed inverter technology adjusts output to match your set temperature precisely, reducing energy waste compared to fixed-speed systems.
  • SEER2 Efficiency: A 17.5 SEER2 rating lowers your electricity costs over the life of the system compared to models at the federal minimum efficiency level.
  • Pre-Charged Line Set: The included 11.5-foot, 1/4 x 3/8-inch line set comes pre-charged with R-454B refrigerant, eliminating the need for vacuum pumps during installation.
  • Wi-Fi Connectivity: Built-in Wi-Fi lets you connect to your home network and adjust temperature settings remotely through a smartphone app.
  • Remote Control: The included IR remote lets you switch between heating, cooling, and fan-only modes or adjust fan speed from across the room.
  • Indoor Growing: Rated for indoor growing applications, giving you precise climate control for grow rooms up to 550 square feet.
  • Certified Performance: ETL listed, UL listed, AHRI certified, and CSA certified, verifying the system meets third-party safety and performance standards.

Sizing Your MRCOOL DIY Select for the Right Space

With 12,000 BTU of heating and cooling capacity, this DIY Select system is rated to cover rooms up to 550 square feet, making it a strong fit for bedrooms, home offices, dens, and small-to-medium living areas. If your room has high ceilings, large windows with direct sun exposure, or heat-generating appliances, consider whether the additional thermal load requires a higher-capacity model in the DIY Select series. Because this is a single-zone system, its indoor air handler works with the outdoor condenser to condition one defined area, so plan your placement around the space where you spend the most time.

Sylvane's Expert Take

If you're a homeowner looking to add heating and cooling to a single room without hiring a contractor, the MRCOOL DIY Select is built for you. Compared to traditional HVAC additions that require professional installation and ductwork, this 12,000-BTU system lets you handle the entire setup yourself using the pre-charged 11.5-foot line set, which eliminates the most technical step of the process: refrigerant handling. The variable-speed inverter compressor is what sets it apart, because instead of cycling on and off at full blast, it ramps up and down to hold your set temperature more consistently, meaning fewer temperature swings and lower energy bills over time.

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