I got a fan blowing through the 400 watt hps i got in there and a regular oscillating fan also. I opened up the top part of the closet that leads up to the attic so that the hot air doesn't get trapped in the there. Do you think that would suffice? The temps may rise a little bit in the next coming months also. I also keep the closet cracked open to let fresh air in, along with a curtain draped over the door so no light gets in only air.hows your ventilation? if youve got good ventilation you'll be fine. My grow regularly hits temps in the 90-95 range during the summer and my plants do as well as they do with cooler temps.