OK, I have two large land tortoises in a wood housing. Right now, we're using heating lamps and ceramic heater to provide warmth. I time regulate these lamps with one of those timer power plug. It would be nice if there's a plug or device that I can plug these heating lamps to that will regulate the temperature (eg. kicks in if it goes below 75F and turn the power off if it goes after 75F). Does one exist?