Both purifiers share the same fan, the same PECO-HEPA Advanced filter and the same 875 sq ft coverage, so they clean the air identically. The difference is how much each one can tell you about it.
PECOAir monitors particulate matter, TVOCs, humidity and temperature, and uses those readings to drive Auto Protect mode and the live air quality view in the Molekule app.
PECOAir+ adds a more advanced sensor suite: a second TVOC sensor, a True CO2 sensor that measures carbon dioxide directly rather than estimating it, and the data behind the app’s Viral and Mold Indexes, which show when a room’s conditions favor mold growth or viral transmission. It’s the model for anyone who wants their purifier to work as a full air quality monitor, especially in bedrooms and home offices where CO2 builds up behind a closed door.
If you want cleaner air, either model does the job. If you also want to see what’s happening in the room and why, choose PECOAir+.