Kasco's C-20 allows you to determine at what air temperature and time of day the de-icer turns on by using both an air temperature controller and timer clock. Time function sets de-icer operation duration, and temperature sensor starts the de-icer only when temperature falls below the set threshold. Both settings are user controlled. The Kasco C-20 will only operate your Kasco De-icer when both the timer and thermostat are activated. Kasco's C-20 is manufactured for outdoor use. The energy efficient C-20 Controller will allow you to operate your de-icer with optimal energy usage to operate your Kasco De-icer with maximum energy conservation.