Shopping DIY mini splits for 2026? MRCOOL delivers 24 SEER2, while Zone Air...

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Shopping DIY mini splits for 2026? MRCOOL delivers 24 SEER2, while Zone Air rates at 23 SEER2. The real choice: better value for heating above -15°F, or Hyper Heat that keeps working down to -22°F in colder winter weather.