MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make a close matchup. Choose MRCOOL...

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MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make a close matchup. Choose MRCOOL for best value above -15°F; pick Zone Air Hyper Heat for heating down to -22°F. Let your coldest nights—not the one-point efficiency gap—make the call.