i apologize i read that wrong. it is a 'national geographic' thermometer/hygrometer that i got from petsmart. yes, there is a heat gradient. if i'm correct, i should get another hide for the cool side right? another member said i could try adding more hides and things to climb to crowd the tank and make him feel more secure. i suppose i should try this idea? do they sell the proper thermostats at lowe's?