You could put the fan and filter on the floor or wherever you want that is out of your way. Keep in mind that heat rises, so your hottest air will be up near the top of the tent. Improved air circulation inside the tent will help. The carbon filter will not mess with C02 in any way. I like to hang the filter from the ceiling so that hot air is being pulled out from the top and cool air comes in through the bottom. You should be able to get the 5 degree drop you are lookin for. Good luck and good vibes.