[BobbyTables2]

Indeed, but in practical use (like a mini refrigerator), one will want to insulate the hot and cold sides from each other.

If one makes the walls thick, then they end up with a hole for the Peltier device and somehow sandwich two heatsinks on the device while maintaining insulation around it.

Perhaps easier to deal with in CPU cooling and such since one side is simply smacked into the thing being cooled.