I purchased two (2) air purifiers for my house. I was very skeptical of whether they would work as I was told. WOW WHAT A HUGE SURPRISE - they work great. I actually can tell how well they work as before the air purifiers, I could literally dust every 5 minutes. Now, not even once a week (and I have 3 dogs). Plus the air smells cleaner in the house! I am impressed. THANK YOU!