2026 DIY mini split face-off: MRCOOL brings 24 SEER2; Zone Air, 23 SEER2. The...

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2026 DIY mini split face-off: MRCOOL brings 24 SEER2; Zone Air, 23 SEER2. The key choice is simple: best value above -15°F, or Hyper Heat down to -22°F. Match the unit to your coldest nights and budget before you buy, and check local installation needs.