A maker of portable, floorboard, and electric heaters, Hydrosil helps customers lower their heating costs with its line of energy-efficient temperature control systems. The company's advanced heating systems use thermostats that contain microprocessors that sense both room temperature and the energy use of the heater. Whenever the microprocessor registers a change in room temperature, the heater responds with a proportional amount of power to manage the room's temperature and energy control to within a half a degree. Hydrosil heaters also contain a sealed copper compartment filled with a silicone liquid that never needs to be replaced.