So far it's great we had bought two one for the bedroom and one for the living room. They are quiet, good looking but the real test will be the allergies season which is on the way. The reason for the 4 star was I was disappointed because our local electric co, Exelon/PECO does not have these as an energy efficiency appliance which other products are. If I would have known this ahead of time I would have probably bought different units. Now I stuck with the cost of electric.