Corn temps

[Bogertophis]

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In my experience with corns, over 85F or so, and they will avoid it. Low 70's is probably too cold to easily digest though. So make sure the hot spot is really dialed in and there shouldn't be any issues.

Corns are pretty hardy animals.

Exactly. They avoid UTH that's too warm. They can still digest at 70* but much slower. All my corns know where to go after eating, & for how long to digest...trust them.
They evolved knowing what they need- and make excellent pets, with normally-nice temperaments, beautiful colors, & nominal size.