Adding a Second Heat Source

[MontyPython22]

Another heat mat will add a heat source but it will barley up the ambient temp in the tank. If you grab a 50w red heat lamp that will do a better job of upping the whole tanks temp. Is your mat currently hooked up to a thermostat? what size tank do you have? wheres the humidity at?( a heat lamp will drop the humidity inside of a tank).
Either way adding a heat bulb will be much more effective then adding a UTH to the back of your tank.

NEVER put tape in a snakes enclosure.