We live in an old house in a cold, damp climate, and my biggest issue has been recurrent fungal infections, plus allergies and asthma. The air cleaner is for the bedroom and it's wonderful! I notice the difference so strongly when I step out of the room - the air in the hall feels heavy, and full of odors. It's just been working for 3 days, so I can't comment on long-term health effects, but so far the experience is great.