2026 DIY mini split matchup: MRCOOL offers 24 SEER2; Zone Air, 23 SEER2. The...

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2026 DIY mini split matchup: MRCOOL offers 24 SEER2; Zone Air, 23 SEER2. The key? Best value for temps above -15°F, or Zone Air Hyper Heat for heating down to -22°F. Choose based on your winter lows—not just efficiency or your home’s usual coldest nights.