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The MRCOOL DIY Select 18K is a single-zone ductless heat pump that heats and cools up to about 800 square feet. Its main draw is the pre-charged Quick Connect line set with R-454B refrigerant, so a homeowner can mount the indoor air handler, run the 11.5-foot line set and start it without a vacuum pump, gauges or an HVAC license. Efficiency is solid for the class at 17.3 SEER2 and 8.5 HSPF2, and Wi-Fi control works with Alexa and Google Assistant. Against pro-installed brands like Mitsubishi and Fujitsu it gives up some low-temperature heating headroom and multi-zone flexibility, but it removes most of the install cost and hassle.
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Lowest price we've seen: $1,690.00 on Nov 9 at Amazon. Tracked across 1 store since Nov 9.
Owners rate it very highly and mostly talk about how manageable the install was and how well it heats and cools. Complaints center on long delivery waits and a steep restocking fee on returns, plus some confusion setting a thermostat schedule.
The MRCOOL® DIY® Select 18,000 BTU 230V Ductless Mini-Split Heat Pump System delivers powerful, energy-efficient heating and cooling for spaces up to 800 square feet, with a 17.3 SEER2 cooling rating and 8.5 HSPF2-4 heating efficiency. Built for true do-it-yourself installation, this complete system pairs the DIYS-18-HP-C-230A11-O outdoor condenser with the DIYS-18-HP-WMAH-230A13-O indoor air handler and includes a factory pre-charged 11.5-foot Quick Connect® line set with environmentally friendly R-454B refrigerant — no vacuum pumps, gauges, or HVAC experience required. Smart Wi-Fi control via the MRCOOL® Comfort app, Amazon Alexa and Google Assistant compatibility, Gold Fin® corrosion-resistant coating, and a 2-year compressor / 1-year parts warranty round out a reliable, year-round comfort solution.
Key Features
Complete DIY® Mini-Split System: Includes the DIYS-18-HP-C-230A11-O outdoor condenser and DIYS-18-HP-WMAH-230A13-O indoor wall-mounted air handler — everything needed for single-zone comfort
Powerful Heating & Cooling: 18,000 BTU capacity efficiently conditions spaces up to 800 square feet
High-Efficiency Performance: 17.3 SEER2 cooling and 8.5 HSPF2-4 heating ratings for year-round energy savings
True DIY® Installation: No specialized tools, HVAC certifications, or prior experience required
Pre-Charged Quick Connect® Line Set: 11.5-foot line set factory pre-charged with R-454B refrigerant — no vacuum pump or refrigerant handling needed
Eco-Friendly R-454B Refrigerant: Lower global warming potential for environmentally responsible operation
13-Foot DIYPRO® Cable: Replaces traditional electrical conduit while protecting wiring from moisture, pests, and outdoor exposure
230V Power Supply: 1.5-ton system designed for 230V/60Hz single-phase operation
Smart Wi-Fi Control: MRCOOL® Comfort app enables remote temperature control, scheduling, and energy monitoring from anywhere
Voice Assistant Compatible: Works with Amazon Alexa and Google Assistant for hands-free control
Wireless Remote Included: Convenient on-the-spot adjustments without reaching for your phone
Advanced Comfort Modes: Sleep Mode, Dry Mode, Auto Mode, and Fan-Only Mode for tailored indoor comfort
Programmable Scheduling: Set custom on/off and temperature schedules to maximize efficiency
Gold Fin® Condenser Coating: Enhanced corrosion resistance for durability in humid or coastal environments
Inverter Technology: Variable-speed compressor for stable temperatures and reduced energy consumption
Reusable Air Filter: Washable filter design reduces ongoing maintenance costs
Backed by Warranty: 2-year compressor warranty and 1-year parts warranty for added peace of mind