Comparing MRCOOL and Zone Air in 2026? MRCOOL offers 24 SEER2 versus Zone Air’s...

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Comparing MRCOOL and Zone Air in 2026? MRCOOL offers 24 SEER2 versus Zone Air’s 23. Choose MRCOOL for best value in climates above -15°F; go with Zone Air’s Hyper Heat if you need heating down to -22°F.