I am setting up a grow area in my attic, I have good ventilation (roof exhaust fan on thermostat right above area. my problem /question is becuase my attic has open eaves and a ridge vent in the roof the temp and humidity fluctuate with the outside temp... it can get real hot or cold depending on whats going on outside. I figure if i start now I will avoid the middle of the summer scorch. Its is not that cold anymore so cold is not an issue. if I keep a fan runnig while lights are on this should help move the hot air away from plants? any input on this setup would be appreciated