Choosing a DIY mini split in 2026? MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2...

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Choosing a DIY mini split in 2026? MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 are close on efficiency. The real call: best value above -15°F, or Zone Air Hyper Heat for heating down to -22°F? Check your winter lows before you buy.