Hi cman, I will tell you that in my experience, the little ones don't do shit. I wasted money on a couple of them before I got what I really needed: a 50 pint Frigidaire. My grow room is in a spare bedroom, so my space is bigger than yours. But depending on your ambient humiidity and where you have your tent, I'd say perhaps invest in a slightly smaller one, like a 35 pint, but if you have to control humidity like I do (I live in the humid dirty south), you may end up getting the larger one.