I have 4 birds and a golden retriever. I am constantly changing the smaller filters in the bird cage area. In spite of that I have had dander and dust all over the first floor of my house. This new air purifier solved that problem. The air feels cleaner, and I have a lot less dust. It is also VERY quiet. When I turned the air purifier on it was so quiet that I was not sure it was working until I felt the air moving from the top.