as far as the heat goes,which is pretty amazing with cfls your whole house must be hot,because cfls barely put out heat,but anyway since your box isn't exactly stealth and you only plan to keep the plants inside a month or so then throw the box away and just set up in the corner of your closet.you will use 3 closet walls then make a removable one out of cardboard wraped in foil.it should keep the heat down plus make it easier to use a fan.also lower the lights to 1 inch above the top of the plants you dont want them to be streatching to get to the light.good luck and keep it up.:thumbsup: