The Iqair Gc Multigas Air Purifier has a self monitoring system that shows the life left in the filter. so you know when its time to change it, and not forget.It weighs around 51 lbs but if you leave it in the corner of a room, it will do its work. the best place to search would be http://www.airpurifiers.com/products/iqair/gc-multigas.htm. Overall, I would use this. It is compact and high quality as well as being able to serve as a whole house air purification system, depending on the size of your home of course. 
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