This is a large size heated Cedar house, measures 21"x21"x24"H on the outside and 16"x16"x14"H on the inside. The floor is vinyl with removable carpet on top. All interior lined with Cedar. The floor, walls and attic are insulated. The house is heated with an infrared bulb installed in a recessed light fixture in the ceiling so it is out of Kitty's way. The bulb only comes on when heat is needed. The front of the house opens for easy access and cleaning. House has a square window and a Large Trixie Door door that will fit the biggest cat. The siding & Trim are Cedar and finished with a clear penetrating sealer.