For 2026, this DIY mini split comparison pits MRCOOL at 24 SEER2 against Zone...

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For 2026, this DIY mini split comparison pits MRCOOL at 24 SEER2 against Zone Air at 23 SEER2. The real choice: best value for climates above -15°F, or Zone Air Hyper Heat for reliable heating down to -22°F.