Comparing MRCOOL and Zone Air DIY mini splits for 2026? MRCOOL offers 24 SEER2;...
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Comparing MRCOOL and Zone Air DIY mini splits for 2026? MRCOOL offers 24 SEER2; Zone Air, 23. Choose the best value if you heat above -15°F, or Hyper Heat for operation down to -22°F. Your winter lows—not the small efficiency gap—should make the call.