What is the proper heating method for a kingsnake?

[Arboreal]

Use two thermometers. I would recommend you use an overhead heat lamp, as in the wild, they don't warm up by sitting on the warmed earth (it helps), they usually use the sun's warmth. Keep in mind they do go to warm areas on the ground to HELP thermoregulate, but overhead lamps are easier to use, and have less risks, such as not melting plastics. I hope I helped!