Effective!
This thing is really neat. My boyfriend and I live in a super old apartment that hasn’t been rehabbed (almost time to move out - yay!) and it has a lingering musty smell if we don’t keep windows open. Last time we went away for a couple days, we closed everything up and only had this plugged in in the living room. Low and behold, the musty smell was gone or very minimal, so I know this thing is working. My only pet peeve is that it’s not silent. While not loud, you can hear the small fan inside when it’s quiet. Otherwise I’d give 5 stars.
Rating: 4 stars