I wrote a blog about using IQAir Air Purifier in my bedroom. If you missed that, you can read about it here. I recently had another opportunity to see how well this machine works. I got a summer cold a few weeks ago and just could not get rid of it. Didn't feel bad anymore, but had nagging congestion, especially at night.
Just as it sometimes goes when you have your own business, I needed new filters for my IQAir but I couldn't remember to bring them home. I finally did, and after a few days, voila, congestion gone. So, once again, I am a firm believer that this machine really works. I had never been able to completely get rid of congestion at night until I started using it.