Hey Trenton. I think you would be fine with 2 - 315w units. One over each 3x3 area with a good strong 8" exhaust pulling the heat out. Look for a unit with a remote ballast so it can sit outside the room, I wish my dual 315 had one instead of being attached to the hood. With the weather cooling down you'll probably be good without an AC. If you're not happy with the end results from 2 separate 315s after one run, get 1 or 2 more for your next run. I just had a quick peek in my tent and I can't believe the trichome production with the CMH, its crazy.