Hands down, best purifier out there for the price. I can’t believe how much odor is reduced by just one unit! I have one in my studio, one outside the studio and it keeps things very fresh. I have one in my bedroom and it’s made it so I can really breath again. I just bought another for my living room. The electric bill didn’t go up and I run it all day and night with the UV light on. Sound is low, like a light white noise machine. I’ll likely buy yet another unit soon. I’d love one for every room in the house. You wouldn’t believe how much stuff is in the air that this picks up. Thankfully it’s not in my lungs!