I feel like none of you have read the manual that comes along with heating pads. It says that you always have to put it under the tank, and either a reptile carpet or paper towel layer before the substrate. It also says if your home gets over 26.6 degrees Celsius you may need a thermostat or you can unplug the heat pad for a while.
The cool side is supposed to be cool. Also, these are not arboreal snakes, they spend time on the ground. They don't need heat that's frog or gecko would need, they prefer belly heat.
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