Well summer is back and my room is getting into the upper 80's and my 8 in blower is not enough. If I were to hook up a portable ac for the hot days wouldnt the cold air just get scrubbed into the attic. I have a central air vent in my grow room and i was spending about $150 a month just to run my central ac. My guess is it was just blowing the cold air out the exhaust.