This is a large size house measuring 21"x21"x22"h on the outside and 16"x17"x14"h on the inside. The floor is VINYL with a piece of removable carpet on top. The floor, walls and attic are insulated. The house is heated by a 50 watt infrared bulb installed into a recessed light fixture in the ceiling so it is out of the way. There is an adjustable thermostat mounted inside the door, the bulb only comes on when heat is needed. There is also a thermometer mounted on the inside back wall. This house has the Large Trixie Door. The house comes with a 20 ft cord. The front of the house opens for easy access and cleaning. The siding is painted lt. blue and the trim white. Also includes a weatherproof outlet mounted on the back and a heated water bowl.