I have had allergies for many years and have tried all types of air purifiers including the ionizers that make ozone. I found blueair filter system to be the best out there. I got my first blueair at costco and discovered they had even better models on their website. My advice is to get the ones that do at least 600 sq feet. The ones that do only 300 sq feet are just not good enough. Yes the filters are expensive which is why it is better to get a filtration system that is larger.

We ordered a replacement filter for our air purifier and the company accidentally sent us two. When we informed them of the mistake, instead of thanking us for being honest, they sent us an email saying that we would have to repackage the filter and take it to a Fed ex store. They then threatened that if they didnt receive it back within thirty days, they would charge my credit card. Speaking of ungratefu! Maybe I'm mistaken, but I believe that would be unlawful use of my credit card. I didn't expect anything for free. If I did I wouldnt have contacted them in the first place. I just didn't expect to be treated like a criminal for doing the right thing. Maybe that is their new tactic to sell more filters. Terrible customer service. Buy a different product from a better company.