DIY mini splits in 2026: MRCOOL gives 24 SEER2; Zone Air, 23. The key choice is...

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DIY mini splits in 2026: MRCOOL gives 24 SEER2; Zone Air, 23. The key choice is simple: best value for heat above -15°F, or Hyper Heat down to -22°F. Pick for your coldest nights, not the rating alone. Check local lows before you buy first.