well i didn't have ventilation on my first grow because the guy at the hydro shop said i didn't need it. i have plenty of ventilation with 6" ducting now. since just after my first harvest. they did love it but i'm still like jeez i know i didn't screw up that badly to have such bad yield. even worse, if i don't prop the door of my grow room open on a 75 degree day, it'll be 90+ in there. i live where in a couple months it could be 110 making my grow room 130-140? . looking at ac units but i really think i might as well just cut a hole in my pockets. or sign my checks to pg&e. i can only have 6 mature plants legally and i smoke a qp every 2 months. i have about $1000 invested into the grow room but i just don't have any faith i'm gonna be able to cool it down.