I have a northern pine snake (also Pituophis) and I have also noticed him do that. I checked and re-checked temperatures, expecting him to at least occasionally use the warm side, but I literally never see him over there unless he is just cruising around and passing through. I've had him about a year and a half with no issues.
I've even moved his hide over to anywhere from completely in the warm zone to just on the edges -- He then refuses to use it and camps out generally in the cool zone. I thought this was an indication of temps that are too warm but he doesn't seem to care.
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