For 2026, MRCOOL’s 24 SEER2 beats Zone Air’s 23 SEER2 on efficiency. The real...

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For 2026, MRCOOL’s 24 SEER2 beats Zone Air’s 23 SEER2 on efficiency. The real choice: MRCOOL for best value above -15°F, or Zone Air Hyper Heat for heating down to -22°F.