MRCOOL DIY® Select 12K BTU Single Zone Mini Split Heat Pump 115V

Built on proven MRCOOL® technology, the DIY Select series offers a budget-friendly alternative to traditional ductless systems while still delivering the features that matter: inverter-driven efficiency, quiet operation, smart control, and simplified installation.

What Makes the DIY Select 12K Different?

Many low-cost mini split systems still require proper evacuation, specialized tools, and refrigerant handling. When those steps are skipped, performance and longevity can suffer. The MRCOOL DIY Select 12K eliminates that risk with factory pre-charged Quick Connect® fittings, allowing homeowners to install the system without opening the refrigerant circuit.

The result is a simpler, cleaner, and more reliable installation process that removes one of the biggest barriers to owning a ductless mini split system.

Key Features

• 12,000 BTU heating and cooling for spaces up to 550 sq. ft.
• 115V operation ideal for residential applications
• Includes 11.5 ft pre-charged Quick Connect® line set
• No vacuuming or refrigerant handling required
• Up to 17.5 SEER2 cooling efficiency
• Up to 9.0 HSPF2-4 heating efficiency
• Inverter-driven compressor for consistent temperature control
• Ultra-quiet operation as low as 17.5 dB(A)
• Smart control via MRCOOL® Comfort App
• Compatible with Alexa and Google Assistant
• R-454B refrigerant for future-ready performance
• White indoor air handler standard
• Black indoor air handler option coming soon

Includes 11.5 ft Pre-Charged Line Set

The included 11.5 ft pre-charged line set is a major advantage over standard DIY systems that often include longer 16 ft or 25 ft line sets. This shorter length helps reduce excess coiling, resulting in a cleaner and more professional installation.

For installations requiring longer runs, optional pre-charged line sets are available in 16 ft, 25 ft, 35 ft, and 50 ft lengths.

Designed for True DIY Installation

The MRCOOL DIY Select 12K removes the most complicated part of mini split installation. The pre-charged Quick Connect® line set eliminates the need for vacuum pumps, gauges, and refrigerant handling, allowing homeowners to install the system with basic tools.

This significantly reduces installation cost while maintaining reliable system performance, making it an ideal solution for homeowners who want professional-level comfort without the professional install bill.

White Standard, Black Option Coming Soon

The system includes a standard white indoor air handler designed to blend into most residential spaces. MRCOOL has also introduced a black air handler option for the DIY Select series, ideal for modern interiors, garages, and design-focused environments.

The black SKU has not yet been released but will be available as a selectable option once launched.

Smart Control and Connected Comfort

Control your system from anywhere using the MRCOOL® Comfort App. Adjust temperature, set schedules, and monitor performance directly from your smartphone. Voice control compatibility with Amazon Alexa and Google Assistant adds even more convenience.

12,000 BTU System Specifications

Ideal Applications

• Bedrooms
• Living rooms
• Home offices
• Garages and workshops
• Rental properties
• Additions and bonus rooms

Why Buy from MRCOOL DIY Direct?

MRCOOL DIY Direct specializes in MRCOOL DIY mini split systems, installation accessories, and replacement parts. We help homeowners across the country choose the right system for their space, layout, and budget.

If you're looking for a mid-size DIY mini split that balances power, efficiency, and ease of installation, the MRCOOL DIY Select 12,000 BTU Mini Split Heat Pump delivers dependable comfort without the installation cost.