Shopping DIY mini splits for 2026? MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2...

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Shopping DIY mini splits for 2026? MRCOOL’s 24 SEER2 and Zone Air’s 23 SEER2 make efficiency close. The real choice: best value above -15°F or Hyper Heat designed to operate down to -22°F. Match the system to your winter lows.