MRCOOL DIY 18,000 BTU 21.2 SEER2 5th Gen Hyper Heat Single Zone Mini Split Ceiling Cassette System - 230V

The MRCOOL DIY 18,000 BTU 21.2 SEER2 5th Gen Hyper Heat Ceiling Cassette System is a complete 230V single-zone mini split that heats and cools spaces up to 800 square feet, with heating that keeps working in outdoor temperatures down to -22°F.

Two things set this system apart. The Hyper Heat condenser holds its heating output in serious cold, which makes it a legitimate year-round heat source in northern states, not just a summer AC with a heat mode. And the OuttaSight ceiling cassette sits flush overhead, so the only thing visible in the room is a slim grille instead of a wall unit. The kit ships complete with a 25-foot pre-charged Quick Connect line set, so there's no vacuum pump, no gauges, and no special tools or refrigerant certification.

Ideal Spaces

• Primary suites and bedrooms in cold-winter climates
• Living rooms and open-concept spaces
• Garage gyms and heated workshops
• Sunrooms and four-season porches
• Finished basements
• Short-term rentals where looks and quiet matter

In a typical insulated space, it will handle up to 800 square feet with no problem. For tougher spaces like an uninsulated garage or a sunroom with lots of glass, plan on around 650 square feet.

Features

• Heats down to -22°F. The Hyper Heat inverter compressor keeps producing usable heat when standard mini splits fall off, so it can carry a room through a real winter.
• Disappears into the ceiling. The OuttaSight cassette mounts flush and throws air across the room from above instead of blowing at one wall.
• Quiet enough for bedrooms. The cassette runs between 26 and 44 dBA, about the level of a quiet library.
• 21.2 SEER2 efficiency. ENERGY STAR certified inverter operation that ramps up and down instead of cycling on and off.
• Control from anywhere. Included remote, SmartHVAC app on your phone, or just ask Alexa or Google Assistant.
• Washable filter plus Sleep, Quiet, Auto Cool, and Fan Only modes with Gold Fin corrosion protection on the condenser.

Key Specs

• 18,000 BTU (1.5 ton) heating and cooling
• Rated heating operation down to -22°F
• 21.2 SEER2, 12.5 EER2, 11 HSPF2
• Covers up to 800 sq ft
• 208/230V, 25A max breaker
• Cassette: 26 to 44 dBA, 50.3" W x 9" H x 13.2" D, 45 lbs
• Condenser: 35" W x 26.5" H x 13.5" D, 99.9 lbs
• 25 ft pre-charged R-454B line set, extendable to 75 ft
• ENERGY STAR and AHRI certified

What you should know

A ceiling cassette needs a bit more planning than a wall mount: confirm you have ceiling access and about 9 inches of depth above the ceiling plane before ordering, and check your joist spacing against the cutout. The system runs on a dedicated 208/230V circuit with a 25A max breaker, which most people have an electrician wire. If your winters rarely drop below 20°F, the standard 5th Gen cassette costs less and will serve you fine; this Hyper Heat version earns its price in genuinely cold climates.

Warranty

• 7-year compressor coverage
• 5-year parts coverage

Need help?

Call us at 1-800-514-2418 and our HVAC product specialists will answer your questions and help customize your MRCOOL DIY 18K Hyper Heat Ceiling Cassette System setup.

Order online in minutes. Secure checkout, free shipping, and no sales tax.

Good AirX is an Authorized MRCOOL Dealer. Every unit ships new, factory-sealed, and fully covered by MRCOOL's manufacturer warranty.

Specifications:

Product Documents:

• Brochure
• Installation & Owner's Manual
• Warranty Information