--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 18 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 two large doors fit the biggest cats. Includes a Self Warming Fleece on the floor for even more warmth and comfort.