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 value versus cold-weather reach: Zone Air is the best value for heating above -15°F, while MRCOOL Hyper Heat keeps going down to -22°F. Match the system to your winter lows.