This air purifier is actually quiet in the low and medium settings. When first opened and turned on  I had to change fan to medium because I thought it was broken on low speed. I use this in my bedroom because I have 3 huge windows and of course a huge tree right outside that brings the pollen inside my room so I’m constantly sneezing. I usually leave it on in the morning while I get ready which is about an hour. When I come back I leave it on for another 2 hours while I’m downstairs. And right before bed for another hour, I know there’s an automatic button but I don’t use it. The only con is for the first use it smells, prob from plastic wrapping so leave it on for about 45mins with doors open if your sensitive to the smell. Besides that this air purifier is great it has the filter AND the ion plasma to cleanse the air.