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Have you got the cover on your box with lights inside or cover off and lights hanging over top? I posted at the beginning of your grow if cover on get yourself a 6" inline duct fan at HD for $30 and pop a 6" passive intake hole in side/bottom of your box.It should keep your temps at 80f steady with good air movement. I had the same trouble your having using computer fans and 7 26w cfls until i switched to the 6" duct fan.Mr. Piggy is right-those t5's are gonna heat you right back up again-i have an 8 bank set in my other growcloset and they heat up that small space.