Choosing a DIY mini split for 2026? MRCOOL’s 24 SEER2 edges Zone Air’s 23...

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Choosing a DIY mini split for 2026? MRCOOL’s 24 SEER2 edges Zone Air’s 23 SEER2, but the real call is value above -15°F or Hyper Heat down to -22°F. Match the unit to your winter lows, budget, and needs—not just its efficiency rating.