Choosing between MRCOOL and Zone Air in 2026? MRCOOL’s 24 SEER2 rating makes it...

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Choosing between MRCOOL and Zone Air in 2026? MRCOOL’s 24 SEER2 rating makes it a strong value if you need heat above -15°F. Zone Air’s 23 SEER2 Hyper Heat keeps heating down to -22°F—better for colder winters.