I have a Lasko 5160 Ceramic Oscillating Heater in my office at work. If you rely on the built in thermostat, the room is either too hot or too cold. The room cools off faster than the temperature sensor which is inside the heater and is slow to cool off; the heater fan only comes on at the same time as the heater. You must manually turn the heater on to keep the room temperature from dropping too low though it will shut off when the room reaches the set temperature. A heater that requires babysitting  is a very troublesome appliance.