Buy a thermostat...there are very expensive ones and some simple ones for about $26 that come with a probe that you would put in the tank on top of where the pad is, and set it to 95 degrees summer, with your winter roll back scheme. You're nuts not to use thermostats with any heat device. Also get one that has a fuse or safety circuit to stop it from failing and overheating. Big Apple Herp, ESU and others have one around $26 - $30 as noted above.
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Mike and David at 3-D Pythons
www.3dpythons.com

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