Mine are growing in my coal shed outside and i was having heat problems,i've just extended my cupboard upwards and now have the temp at around 79 all the time.What i found at first is i had to open the cupboard door to let some heat out,even tho i had a vent on top,a hole knocked in the side wall and some vent tubing into the cupboard and a vent on the door to let air into the cupboard.