I use it in my bedroom. I have allergies with asthma, we have five dogs, two cats and a rabbit; I wanted my house to be easy to breathe and I wanted it to be where I sleep. I've been using it for about three weeks now and honestly can't tell any difference in my allergies, but we've just entered a heavy allergy season. I'll say it does something, I just sucked a lot of long cat hair out of the air intake.