Comparing MRCOOL and Zone Air for 2026? Both offer DIY-friendly heating, but...

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Comparing MRCOOL and Zone Air for 2026? Both offer DIY-friendly heating, but the specs suit different needs: 24 SEER2 versus 23 SEER2. Choose the best value for heating above -15°F, or Hyper Heat for warmth down to -22°F.