remember.. heat rises... the top of your closet will be much warmer than the floor..

ventilation is going to be key.. If you can.. pull the air out of the room.. Ideally you will be able to pull it out of the closet and send it into the attic through a hole in your ceiling.. If this is not possible, you can always use a squirrel fan and attatch it to the door knob (remove the door knob) and blow it out the door knob hole.. The only problem with that is.. your bedroom is going to get a bit warm and real stanky...

: )