I did my research before purchasing two of these and this type of purifier rated pretty high. However, it’s odd to me that it blows cold air. Kind of seems like a tower fan and I can’t run it continuously on cold nights because it just makes your room super cold. Others have complained about the noise, it’s not noisy it’s a normal tower fan sound. Which makes me question how effective it is in purifying the air and I don’t know how much use the UV light is. I think for it to function well it has to be on at all times. The room I bought it for smells a bit better but not completely clean like I expected. I bought two and I move them around my house. Thinking of buying another, but not this brand.