I keep them in my boiler room. The water heater is on and keeps the room at 80. Pretty soon the heat will kick on.The house is warm to begin with. I,m lucky in a way. The room the frogs are in is 77 cause its next to the boiler room. .In my room i keep the turtles, monitor,and geckos. They use lights. Oh the whites have a 25 watt blue night bulb..