This extra Large Cat Pod has the same heating system as our more expensive Handcrafted Houses. It consists of a 50 watt infrared heat lamp screwed into a recessed light fixture so it is out of Kitty's way. There is an adjustable thermostat that you can set and forget. The heat only comes on when needed, also has a 20 ft cord. These coolers are very well insulated and hold the heat in very well. Made from an Igloo or Coleman 120 qt cooler Pod measures 16" x 33" x 14" deep on the inside. Will fit 3 to 4 cats. The large Catmate door fits the biggest cats. There is a piece of removable carpet on the floor.