Comparing MRCOOL and Zone Air for 2026? MRCOOL offers 24 SEER2; Zone Air, 23...

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Comparing MRCOOL and Zone Air for 2026? MRCOOL offers 24 SEER2; Zone Air, 23 SEER2. Choose best value if you heat above -15°F, or Hyper Heat if you need heating down to -22°F.