For 2026, MRCOOL’s 24 SEER2 is the value pick for temperatures above -15°F....

https://wiki-byte.win/index.php/MRCOOL_Retailers_Won%E2%80%99t_Take_Returns%E2%80%94What_Should_I_Check_Before_Buying%3F

For 2026, MRCOOL’s 24 SEER2 is the value pick for temperatures above -15°F. Zone Air’s 23 SEER2 trades a point of efficiency for Hyper Heat down to -22°F. Choose based on your winter lows.