For 2026, MRCOOL’s 24 SEER2 edges Zone Air’s 23 SEER2, but efficiency isn’t the...

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For 2026, MRCOOL’s 24 SEER2 edges Zone Air’s 23 SEER2, but efficiency isn’t the whole call. Choose MRCOOL for value in climates above -15°F; pick Zone Air Hyper Heat if you need heating down to -22°F. Compare winter lows before you buy.