Total little POWERHOUSE. Air quality has been 200 with the fires, I live in a 1500 square ft house with single pane windows and two 70lb dogs, and this is keeping up. I do move it between upstairs and downstairs with me (working from homeliving at home) it wasnt meant to handle QUITE this much space, maybe 750sq. ft optimally Its quiet, even on high, I turn it to mediun to sleep with it on. Simple, clean design, easy to use.  Definitely recommend!