I have 2 dogs and 2 cats and run a rescue so I am always looking for something to help with odors and clean the air that won't kill my wallet or electric bill. I placed this unit in my bedroom and I really do like it. First, you can't hear it. Any other purifiers I've had that actually work well are soooo loud. I cant hear this even if I try, had to check it was still on a few times. Plus my bedroom has no animal odors which makes my relaxing time so much more enjoyable!