her current enclosure is on old root celler near my house (made of thick bluestone it used to be used to keep vegetables cool in summer itd like 90 years old) but it turns out its also just as good at keeping heat in, the room is about 3 meters by 5 meters, it has an astroturf floor, 2 275watt bulbs and an electric blacket and the bottom 40cm of a 7000 letire water tank, the water is left unheated and she does fine.