Do you have an actual exaust system set up or just circulation fans going? Without a way to actually take the hot air and move it away from the grow area, you may just be recirculating the same hot air but not actually displacing it. You might consider a 4" inline fan and some ducting. Try opening a window just wide enough to point The duct out, maybe even plug the gap with plexi or plywood . If your situation doesn't allow for the window to be opened, atleast run the duct into another room. This has been huge for me, also, and sorry if this has been covered, but are you turning the lights on after sunset?