as i grow in an attic...a 10 feet long...7 feet wide and 7 feet hight..theres a few ways go too...seal off the whole fucking thing....run the lights during the night to heat the place and then pull ac from a bathroom to cool the room if it gets too hot..i had this for more then a few months where the nights got to the 30's//// my 1000 watt heated everything perfectly....secondly...you can setup hydro huts to make this even better..have one fan on 24/7 to cool the lights..run cool tubes..then have the other fans to push air in and out to corect for the changes in heat..you can draw from the houses own ac system..i had it cooling a hydro hut while it was 101 degrees out side and it was 110 in my attic but the hut was a chill 78 degrees...hope that helps...