indie... can you cut a hole in the ceiling and blow the air into your attic? you don't need to bring fresh air in... you need to blow hot air out (ideally).. when you blow the hot air out fresh cool air will come in through cracks and shit..

if you can, cut a small hole in your ceiling and put a fan in the hole blowing air out of the closet into the attic.. when you shut your closet door you should feel a suction and fresh air will come into your closet from the bottom of the door and blow out into your attic.. this will keep your closet COOL