My house is extremely dusty for some reason. I think it's where I live, so I was really curious to see if this air purifier would help. I like that it has a digital screen that shows how it's cleaning the air. This one is set up in the bedroom and it is generally at 98-100%. I dusted before I set this up about a week ago and haven't had to dust in there yet. Usually within 3 days, I could see the dust. I do think it is making a difference. I'm not waking up as stuffy as I was either. I have seasonal allergies and have not found myself reaching for my meds quite as much. I'm looking forward to see if this continues to help both with dust and allergies. So far, I'm impressed.