Thank you for the info.
I use a thermostat with a probe for my uth's now. I also have a thermometer with a probe right next to it as a double check. The cool side is room temp, 80* when I'm gone, 76-78 when I'm home, 72-74 at night.
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Oh, ok. I was going off this: “Provide your corn with a basking spot of 88-90° F”
I found here:
http://ball-pythons.net/forums/showthread.php?127291-Corn-Snake-(Elaphe-guttata-guttata)