i have a 3x3x7 with a 600 but it is a cooltube. my buddy has a tent same size as yours with a 600 no cooltube, he runs flex air duct from a window a/c thru a homeade filter and into the tent. Temps around 77 highest ive seen them was 79 also keep in mind he has 2 osc. fans in there as well. The...