A simple but very useful device made right here in Klamath Falls OR. The Add-A-Stat has many uses. We, the owners, use them around the home for ourselves. One use in our chicken coop to turn on the heat lamp when temperatures approach freezing. Another use is to connect to the oil pan heater of our diesel truck so that is not running all the time but only when temperatures drop. And we also use it in our RV to turn on a small electric heater to keep pipes from freezing. So as you can see there are many ways the Add-A-Stat can be used.