Yeah I thought it wouldn't be as loud as some of the fans I am using (which I consider to be pretty loud) but I was wrong. I would say the loudness is equivalent to running a tumble drier in the same room lol. Good but noisy. I have decided to turn it off for a bit for now. It got the temp down to 20c after an hour or so, which is good. I think it's one of those that you just use when you absolutely have to, otherwise leaving it on all the time would be annoying, at least for me.