Choosing between MRCOOL and Zone Air? MRCOOL’s 24 SEER2 tops Zone Air’s 23, but...

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Choosing between MRCOOL and Zone Air? MRCOOL’s 24 SEER2 tops Zone Air’s 23, but climate is the key: go for the best value above -15°F, or choose Hyper Heat for reliable heating down to -22°F.