Choosing a 2026 DIY mini split? MRCOOL rates 24 SEER2; Zone Air, 23. The key:...

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Choosing a 2026 DIY mini split? MRCOOL rates 24 SEER2; Zone Air, 23. The key: Zone Air is the value pick above -15°F, while MRCOOL Hyper Heat heats down to -22°F. Choose for your winter and home’s heating needs, not just efficiency on coldest nights.