For 2026, compare MRCOOL at 24 SEER2 with Zone Air at 23 SEER2. The key choice:...

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For 2026, compare MRCOOL at 24 SEER2 with Zone Air at 23 SEER2. The key choice: best value if winter lows stay above -15°F, or Hyper Heat for warmth down to -22°F. Choose for your coldest nights, not the rating alone.