MRCOOL DIY 12,000 BTU 23.5 SEER2 5th Gen Hyper Heat Single Zone Mini Split System - 230V

The MRCOOL DIY 12,000 BTU 23.5 SEER2 5th Gen Hyper Heat Single Zone Mini Split System pairs cold-climate heating that runs at -22F with the highest cooling efficiency in the Hyper Heat single-zone line, covering rooms up to 550 square feet on 230V power.

Like every DIY series system, it goes in without a contractor. The 25 ft pre-charged Quick Connect line set means no vacuum pump, no gauges, and no special tools or refrigerant certification, and the DIYPRO cable shields the outdoor connections from weather and wildlife. Most homeowners have it mounted and connected in an afternoon.

Ideal Spaces

• Bedrooms and home offices in cold climates
• Four-season rooms and finished attics
• Insulated garages, workshops, and studios
• Cabins and bunkhouses that see subzero nights

The 12K size is matched to single rooms up to 550 square feet. Where Hyper Heat earns its keep is winter: it will still be producing meaningful heat on mornings when a standard heat pump has given up, though a poorly insulated space will always demand extra capacity.

Features

• Full heating at -22F: Hyper Heat inverter technology keeps this unit working as a real heat source through subzero weather, not just a shoulder-season supplement.
• 23.5 SEER2 cooling: the best cooling efficiency of any Hyper Heat single-zone size, ENERGY STAR certified, with a 12.8 EER2.
• Modest electrical footprint: needs only a 15A max breaker on a dedicated 208/230V circuit, the lightest requirement in the Hyper Heat range.
• Smart control every way: included remote, SmartHVAC app on iOS and Android, Amazon Alexa, and Google Assistant.
• Washable, reusable filter: rinse it clean instead of buying replacements.
• Flexible indoor options: the condenser also pairs with the DIY OuttaSight ceiling cassette if you prefer a low-profile look over the wall mount.

Key Specs

• Cooling capacity: 12,000 BTU
• Heating capacity: 12,000 BTU, rated operation to -22F
• Efficiency: 23.5 SEER2, 12.8 EER2, 10 HSPF2
• Coverage: up to 550 sq ft
• Power: 208/230V, single phase, 15A max breaker, 15A min circuit ampacity
• Sound level: 56.5 dBA outdoor condenser
• Line set: 25 ft pre-charged Quick Connect, extendable to 75 ft max

What you should know

Whether Hyper Heat is worth the upcharge over the standard 5th Gen 12K comes down to your winters. In a climate that rarely dips below 20F, the standard unit does the same job for less. In a place with real subzero stretches, Hyper Heat is the difference between a heat pump you rely on and one you back up with space heaters.

This is 5th Gen equipment running R-454B refrigerant, so it does not mix with 4th Gen (R-410A) line sets or components. It needs a dedicated 208/230V circuit even though the breaker requirement is only 15A. At about 72 lbs, the condenser is the lightest in the Hyper Heat range, but a helper still makes placement easier.

Warranty

• 7-year compressor warranty and 5-year parts warranty with product registration.
• Register the system with MRCOOL after installation to secure the full coverage.

Specifications:

Need help?

Trying to decide between Hyper Heat and the standard 5th Gen? Call 1-800-514-2418 and we will size it with you. 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.