I initially bought two Alen air purifiers after doing in depth research into different models and types. Alen was by far the best rated. I am so happy with the two I purchased, I purchased another about a month ago. I have one in my bedroom, one in my main area of the home and now another in the room where my two little dogs stay during the day. 

When I bought my home two years ago, it didn't take long to discover a cat had lived there and I am highly allergic to cats and had to tear out all my floors, clean the vents, etc. I still had some issues so bought the air purifiers and couldn't be happier that I can now breath again and the best news is you hardly need to dust!