There is a thermostat that I use with great success to regulate my UTH's and it's from hydrofarms you can get it on amazon and i'm sure other places as well. I started with some of the models in the pet store and moved to this one and I love it even though it is meant for heat mats for plants . It works great and according to my thermometers is very accurate once set . I use one for my big red-tail as well as my bp , juvi red-tail and cali king and all are in great condition .