I read through all the reviews and almost didn't buy it because of all the complaints about noise, but I decided to try it anyway as its features where the best within my price range. I am so glad I decided to give it a try! I plugged it in and Surprise! Surprise! it sounded like a fan. (major eye roll moment) Do people really expect that an item designed to move large amounts of air through a filter wouldn't sound like a fan?? Like having a fan running during the summer it quickly becomes background noise. I've only had it plugged in for a few hours and I'm already sneezing less!