My mother-in-law has two of these in her house that she keeps running 24/7, and has sworn by them for years. I have had this one for a week and can already tell a difference. It's the air, the aromas, and the fell of the house that's different. It's very hard to explain, but I would definitely recommend trying one or two depending on your house size. I also ordered a small wall plug-in at the same time for my office. I love these.