I can't seem to get my grow room temps below 83f i have a portable air cond about 15 feet away exhausting out a patio door. I have a fan blowing into room and 1 blowing out. 400 watt hps. I'm on 12/12, dark period temps are 77f. Am I in great danger of heat stress? They look like they are doing well 2weeks in flower @ 36" tall, 4 plants in all.