They say it is what is on the inside that counts. This dog house is insulated, wired for a light bulb to provide heat. It was inside a yard shed, so 2 sides do not have tin, but that can be added. We no longer have our dog, so this can go to a new home. We can use the forks to place it on a trailer. Presently sitting outside ready to be adopted by you, free, FCFS.