Hi again! As per my reply to your previous post, cool is OK for a Corn. Their ideal max is around 10 degrees below human core body temp. They will sometimes feel warm if you pick them directly up from the heated part of the tank, but otherwise cool is fine.
Corns in the wild come from areas with a range of temperate climates, Florida in the south, right up to New Jersey and its snow in the north of their range! They're not a tropical snake, so it's pretty easy to overheat them in captivity (I speak from experience when I was a new owner!)