What exactly is the purpose of a gas fireplace thermostat? This is new construction. It is a vented, gas fireplace with an on and off switch. There is a fireplace thermostat next to the furnace thermostat and I'm not sure how to use it. Does it control the amount of heat generated by the fireplace? Is it just for controlling when the fireplace comes on automatically? I can turn the fire on with the switch. I can't imagine having the fireplace come on at a specific time. I have no instruction manual with it (I saved them all), I can't get my builder to call me back and there is no brand name on it, so I can't look it up with the manufacturer to find out how to use it. Thanks