MRCOOL vs. Zone Air in 2026: MRCOOL leads on efficiency at 24 SEER2 versus Zone...

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MRCOOL vs. Zone Air in 2026: MRCOOL leads on efficiency at 24 SEER2 versus Zone Air’s 23. For the best value above -15°F, choose MRCOOL; for heating down to -22°F, Zone Air’s Hyper Heat is the better fit.