He lives in Alabama it is likely he doesn't need heat, most of the time. Besides a UTH in the normal heat or anytime requires thermostat or very close monitoring, a way to control the heat... For one snake a light i.e. red light is easy and allows one to see their snake when it is active, without disturbing the snake. Turn the light off when heat or viewing isn't required. I am basing this on having a few very healthy snakes raised with a red light and monitoring temps.
I talked to my vet and they recommended not get a UTH because they see so many snakes come in from burns....I'm guessing it's more common for snakes to burn in Alabama since people may give them more heat than needed.
I did, however, buy a red light recently and it seems to be working great
I use a normal light during the day and I turn it off for a couple hours every day and let the room cool off, then turn it on the red one for night, later. Seems to be working great so far!