I use a ceramic heat emitter to boost my ambient temps during the winter or I’ll add an electric heater to the snake room. I really don’t pay much attention to the humidity inside my enclosures but it ranges from 30-60% depending on the season. I use Reptichip for my substrate and it holds humidity pretty well. I might dump the water bowl into the bedding if I see a snake prepping to shed but that’s the most I’ll do. You can also add a humid hide when they’re shedding. As long as they have access to fresh food, water, and a proper thermal gradient ambient humidity should be just fine.