For 2026, MRCOOL’s 24 SEER2 edges Zone Air’s 23 SEER2. The choice is...
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For 2026, MRCOOL’s 24 SEER2 edges Zone Air’s 23 SEER2. The choice is straightforward: pick MRCOOL for value if your winters stay above -15 F; choose Zone Air’s Hyper Heat if you need heating down to -22 F.