Simplex,
snakelab's method is this... It likely will work if that is the method you have chosen. The failure is the that not every one has or should have the same set up. I don't I use belly heat as it is more efficient and keeps my power bill down.
His is a single solution among the other possibilities that I have pointed out in other posts. The problem is that other methods and practices he chooses not to recognize. Just like his suggestion that someone looking for their first snake should buy a rack. and contradicting himself (herself) by agreeing that the racks really want higher ambient temps which in the original post the op was trying to avoid. I have no time for people whom cannot or will not believe that there could be other solutions to a given problem.
http://ball-pythons.net/forums/showt...-the-cold-side