MRCOOL vs Zone Air: DIY mini splits bring 24 SEER2 vs 23 SEER2 efficiency. Pick...

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MRCOOL vs Zone Air: DIY mini splits bring 24 SEER2 vs 23 SEER2 efficiency. Pick MRCOOL for value in areas above -15°F; choose Zone Air Hyper Heat if you need heating down to -22°F. Your winter lows—not a tiny efficiency gap—should drive the decision.