For 2026, MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make this a close DIY mini...

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For 2026, MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make this a close DIY mini split heat pump matchup. Choose value if winters stay above -15 F; pick Hyper Heat for heating down to -22 F. Climate makes the call.