He's not in a glass walled cage. It's wire on one side. I am planning on using thermostat to keep one end of room at min 80 degrees. Have a spot light heater aimed at his basking spot. It hits 100 but only after room warms up. I'm not sure if he's warm enough, long enough. Now with breeding season starting, and that being another reason to not eat, I'm just going to be happy ANY time he eats.