For 2026, MRCOOL’s 24 SEER2 tops Zone Air’s 23 SEER2, but the real choice is...

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For 2026, MRCOOL’s 24 SEER2 tops Zone Air’s 23 SEER2, but the real choice is heating range: choose MRCOOL for value above -15°F, or Zone Air Hyper Heat for performance down to -22°F.