I bought the breathe smart with two different filters...one with carbon and one for dust....not very impressed .....it may help some but not enough to matter a lot.....I have a new AC unit and I still have a lot of dust for some reason....and the dust actually lands on top of purifier...I vacuum frequently with a Kirby vacuum cleaner but it still is bad...and I used the carbon filter to help remove odors and the smell stayed in the air purifier which I don't understand if it is a carbon filter.....I have asthma and allergies and I have had no relief with this machine...maybe it is just me.....I do not think it is worth the money at all.