On some models of Georgetown has two different heaters. Our 378 has two. the thermostat in front controls the heater, in our case, under the ref and blows thru the ducts in the floor. it also controls the front A/c. The thermostat in the rear controls a heater, also in the front on the opposite side, located under the stove and blows out two ducts into the living room for more heat. I think I have used it once to see if it works. It is designed to add more heat up front in very cold weather. The rear thermostat also controls the a/c in the bedroom.