There is no reason why a person keeping any animal like a snake or lizard should not know what a thermostat is. I know many lizards require a very warm basking spot but I bet that many lizard keepers use tstats to be safer too.
Use Google or for even better help read threads here and learn how to use our Search function. Almost everything has been asked and it's all there to be found.
I'm not trying to pick on you and I am trying to help you and any animal you may own in the future.