are you using an vivarium? if you are using a 20gallon which seems to be what most people use. put a low wattage CHE on the same side above the UTH. just make sure that you are on top of that coconut substrate because that stuff drys out fast with that CHE. if you are using a large tank try a little higher wattage CHE. tanks are always a challenge to keep just right. some time you just have to experiment and keep in mind its not going to kill your snake to be a little cool.