haha thanks for the post! yeah ive read and learned that tin foil creates way to much heat so i thought maybe one layer for a side would be alright for the time being.. but i guess not because the day i started the tin foil i started to realise the bump so it could be that! the fan is running right now.(i should really invest in an exhaust fan as well for more ventilation) .. and also thanks for the advice in white walls instead of mylar!