I received the Conair medium room air purifier it was very easy to set up.  I turned it on and after about 2 hours I could already tell a huge difference in my dogs room.  A friend came over and immediately ask me how I keep my house from not smelling like dogs since I have two large dogs.  I showed her my new Conair medium room purifier, I have a 3000 square foot home and the Conair medium room air purifier has made a huge difference in my home.  I am purchasing another Conair medium room air purifier for upstairs and then a larger one for the rest of my home.  I did not think that it would make a big difference, and I was wrong.  I can not recommend the Conair medium room air purifier enough trust me it will make a difference in any room in your home.  I am a true believer in the Conair medium room air purifier.