Has replaced my bedroom fan. I crank this up to level 3 to sleep at night. My dogs seem to like it too surprisingly. I'll see them huddled under my bed in that small room so they must enjoy the air quality in there or else they'd buzz off somewhere far away. I've had to change the carbon filter a few times and that gets expensive but it really does get filthy with dust. It was caked on there! But hey, that's stuff I'm not breathing today so I have to be thankful. I run this 24/7 and get mad when someone shuts it off. It's a bit inappropriate but the coolest thing is to rip a huge fart right next to it and have it sense it, turn red with rage, and then it automatically cranks up the power to maximum.