IQAir is great. But if on a budget, I can recommend Coway. They are really efficient, use little energy and not expensive at all: http://thesweethome.com/revie

IQAir is great. But if on a budget, I can recommend Coway. They are really efficient, use little energy and not expensive at all: http://thesweethome.com/reviews/best-air-purifier/ http://thesweethome.com/reviews/best-air-purifier/ I personally own a 1008-DH, which has much better filtration than the 1512 reviewed there. Previous reviews at The Sweet Home also analyzed IQAir, which is probably even better as it filters particles down to ~0.1 microns. I'd love to see an unbiased review testing ultra-small particles.