Hi,
Well one of the problems is snakes can burrow - and 105f is hot enough to cause problems.
You want to have the top of the substrate at the right temperature without the possibility of the animal burrowing down and encountering dangerous temperatures. At this point you are definately going to need some way to regulate the uth. A ceramic heat bulb will also need a thermostat and (obviously) a good gaurd to prevent the snake coming into contact with it - they are also renowned for sucking the humidity out of the tank which leads naturally to my next question.
What kind of lid to you have on the tank at the moment?
Could we have a bit more precise timeframe than "a while" as it can take a tank a day or two to settle down completely depending on the setup?
dr del