Hey Desertrat... So I'm still competing with heat, though it's not nearly as bad as it was. When I have my tent closed up, lights on, portable a/c running, my temperatures stay at a constant 86 degrees inside the tent.
I've jimmy rigged my A/C unit which blows out cold air from an approximately 1x2 ft vent. I put some ducting on one side of the vent with a little DIU magic to carry half of the cool air into the tent. So now the A/C is blowing half into the general room and the other half is ducted through my tent. This brought my temperatures down to 77 degrees which put a huge smile on my face. The problem with this is when my lights kick off, the A/C ducting is still inside the tent and I'm almost positive it's bringing my temperatures down way too much. The A/C is set to its lowest setting at 62 degrees and I can't just put the A/C on a timer cause it keeps the room cool for my other tent which is the same size, but has a 600W MH that is on 24/0.
Ideally I would think a squirrel fan for both tents could do the trick. That way I could just put the fan on a timmer when the lights shut off for my flowering tent. Question is, do I have both fans sucking air out of the tent and venting it into the attic? Would I even need to duct into the attic? Would that force air to come in from the other side or would I need another squirrel fan bringing air in too? How powerful of a fans should I get for this task? Do you personally feel as though this is a good idea, or do you by chance have any other suggestions for me now that I have my overall room temperature under control without having to purchase squirrel fans?
Hope I was able to paint a good enough picture for you to get what I'm trying to say... Take care man.