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

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Choosing between MRCOOL and Zone Air? MRCOOL’s 24 SEER2 edges Zone Air’s 23, but the real call is your climate: best value above -15°F, or Hyper Heat that works down to -22°F. Match the upgrade to your winter lows.