I have been using this for both my bedroom and living room, and I can already tell a difference in fresh air! I initially bought this for allergy season, and it's really living up to the test of clean, purified air. If you're on the fence about purchasing this, don't be! It's much cheaper than a dyson, more mobile, more affordable, and I don't hear it at night when sleeping. I no longer feel congested in the mornings now!