For 2026, this DIY mini split comparison weighs MRCOOL’s 24 SEER2 against Zone...

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For 2026, this DIY mini split comparison weighs MRCOOL’s 24 SEER2 against Zone Air’s 23 SEER2. Choose MRCOOL for value above -15°F, or Zone Air Hyper Heat for heating down to -22°F. Let your winter lows guide the pick.