For 2026, MRCOOL’s 24 SEER2 tops Zone Air’s 23 SEER2, but the best pick depends...

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For 2026, MRCOOL’s 24 SEER2 tops Zone Air’s 23 SEER2, but the best pick depends on your winter. Choose MRCOOL for value above -15°F; choose Zone Air Hyper Heat for heat down to -22°F. Check your local lows, home needs, and budget before you buy.