I’m using this purifier in a very large room and it has really improved the indoor air so much that I can leave it on auto mode and it now runs at a low setting maintaining the indoor air quality.   It also looks really cool. It is the best purifier I have ever owned and has been a lifesaver with asthma and allergies, especially with forrest fire smoke + pollen + road construction dust we are dealing with in the Twin Cities this year.