I have a leo and a corn snake, and while the warm ends of both their tanks are at the proper temperatures, the colder sides seem to be juuuust a little too cold. I think this may be contributing to why my leo isn't eating much as well as why my corn is pretty inactive. I've tried using a heat lamp, but that raises the warm side temperature close to 100F which is way too high for either reptile. Other than increasing my entire room temperature (poor insulation aka would cost an arm and a leg), any tips for raising the cool side a few degrees? For reference both are currently in 20gal tanks, temps being measured with a heat gun.