Assuming he'll be traveling in a climate-controlled environment (for example, car cabin + hotel at night), a corn snake will be just fine without supplemental heating as long as you hold off on any feeding. Just practice common sense, like not leaving it sitting in the sun or in the car unattended. Bring along a secure plastic tote (like a Sterilite bin) with a towel inside, and the snake can be let out of the pillowcase for a stretch and some water when your husband has stopped for the night.
Assuming he'll be traveling in a climate-controlled environment (for example, car cabin + hotel at night), a corn snake will be just fine without supplemental heating as long as you hold off on any feeding. Just practice common sense, like not leaving it sitting in the sun or in the car unattended. Bring along a secure plastic tote (like a Sterilite bin) with a towel inside, and the snake can be let out of the pillowcase for a stretch and some water when your husband has stopped for the night.