Comparing DIY mini splits for 2026? MRCOOL offers 24 SEER2; Zone Air, 23 SEER2....

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Comparing DIY mini splits for 2026? MRCOOL offers 24 SEER2; Zone Air, 23 SEER2. Choose the best value for heat above -15°F, or Hyper Heat for warmth down to -22°F. Let your winter lows—not just the efficiency rating—guide your pick.