Just bought the unit so am looking forward to see the difference it makes in the long run. I am using it on Auto and it’s very quiet but I haven’t tried any set speeds yet. I downloaded the app and ran into a little trouble connecting but it was because of my router. Once I resolved that the app connected and all was good. So far it has been showing my air quality as Great. I have 4 stars because I have only just started using it.
Absolutely amazing... could tell the difference in the air quality through out my home within 20 minutes..give or take....bought 4 more. ...for trips ...and more