Collection: SEERXtreme Series

SEERXtreme is the most efficient series we carry, with SEER2 ratings of 24 to 25 and Energy Star certification on most sizes. It is also the cold-weather series: the heat pumps are rated to keep heating at -15°F outdoors, the lowest floor of any series we stock. It suits a northern garage or addition, or anyone who wants one system year-round.

Sizes run from 12,000 to 24,000 BTU; the 12k comes in 115V or 208-230V, and the 18k and 24k are 208-230V only. Efficiency does not shrink the room: an 18k SEERXtreme cools the same 750–1,100 sq ft as any other 18k, so size with the Sizing Guide. For efficiency without the cold-weather rating, compare the Energy Star mini splits.