You have to either run climate control all the time based on timers that turn on extra exhaust during lights-on and run your lights at night to even out the heat, or put your systems on a thermostat- a good one, that turns on a/c above 75 degrees and turns on a space heater below 65.
Attics are doable but they kinda suck, you really need to treat your attic as if it were a living space if you want to have a successful grow up there. I grow in the attic, it's a walk-up with a couple windows, I have to run a/c from April to September and a heater from Thanksgiving until April Fools.
stinkyattic Reviewed by stinkyattic on . growing in the attic...help!!! im growing in my attic, i tarped off a 8x8x8 area painted it white, i have a 400 wtt mh, there is 25 plants i cut a hole in the roof for intake and exsus.one towerds the top one on bottem.my question is how often should both fans kick on and off??? Rating: 5