Comparing MRCOOL’s 24 SEER2 with Zone Air’s 23 SEER2? The choice comes down to...

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Comparing MRCOOL’s 24 SEER2 with Zone Air’s 23 SEER2? The choice comes down to your winter: Zone Air is the value pick for temperatures above -15°F, while MRCOOL Hyper Heat keeps heating down to -22°F. Choose based on how cold it gets where you live.