MRCOOL’s 24 SEER2 vs Zone Air’s 23 SEER2: compare winter needs. MRCOOL is the...

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MRCOOL’s 24 SEER2 vs Zone Air’s 23 SEER2: compare winter needs. MRCOOL is the better value above -15°F; Zone Air Hyper Heat keeps heating down to -22°F. Choose by your local lows, not just the efficiency rating, and match the system to your home carefully