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

https://www.strobe-bookmarks.win/mrcool-s-24-seer2-and-zone-air-s-23-seer2-make-a-close-matchup-choose-mrcool

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.