For 2026, compare MRCOOL’s 24 SEER2 with Zone Air’s 23 SEER2. The key choice:...

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For 2026, compare MRCOOL’s 24 SEER2 with Zone Air’s 23 SEER2. The key choice: Zone Air for value above -15°F, or MRCOOL Hyper Heat for heating down to -22°F. Choose based on your winter lows—not just the efficiency rating.