I am currently using a Sunbeam room heater with a built-in thermostat to heat up the room my snakes are in. I'm not sure how efficient it is compared to other heaters (looking into that), but it does the job. The thermostat is a dial, and setting it to 80-85 will keep the room at about 80 degrees. It was an inexpensive heater, but I don't remember the exact price.