Shopping DIY mini splits in 2026? MRCOOL vs. Zone Air comes down to 24 SEER2...

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Shopping DIY mini splits in 2026? MRCOOL vs. Zone Air comes down to 24 SEER2 vs. 23 SEER2—and the bigger choice: best value above -15°F or Hyper Heat down to -22°F. Choose for your winter lows, not efficiency alone.