All that is happening is that the fans are cooling the air but then the air is been blown around the tent thus becomeing warm and stagnent.You need a good exaust fan one that will pull air from the grow room and push it outside the room pref into a carbon filter.If you have not got the money yet for a good one go to the local d.i.y centre and buy a couple of extractor fans that are used for bathrooms and kitchens these work realy well.But you will have to get hold of a more powerful one at some time.