For 2026, MRCOOL vs. Zone Air comes down to your winter lows: both deliver...

https://spencersexcellentcolumn.scriblorax.com/posts/how-often-should-i-wash-the-outdoor-condenser-fins

For 2026, MRCOOL vs. Zone Air comes down to your winter lows: both deliver strong DIY heating, with Zone Air rated 24 SEER2 and MRCOOL 23 SEER2. Want best value above -15°F, or Hyper Heat that keeps working down to -22°F?