hello chronic, weed is a plant and does not let off anymore heat than any other plant. you may be thinking of the heat givin off by the lamps when grown indoors.

good luck on your grow. i grow outdoors in tennessee, with good results. i usually plant in mid apr. so the plants don't get too big....they still reach about 7'-8'. just make shure they get plenty of sun and are close to a fresh water source.