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 winter performance: MRCOOL offers better value above -15°F, while Zone Air Hyper Heat keeps heating down to -22°F. Choose for your climate, not just the rating.