For 2026, MRCOOL delivers 24 SEER2 versus Zone Air’s 23 SEER2. The choice comes...

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For 2026, MRCOOL delivers 24 SEER2 versus Zone Air’s 23 SEER2. The choice comes down to climate: MRCOOL is the value pick above -15°F, while Zone Air Hyper Heat keeps heating down to -22°F.