What component controls the temperature of the gas entering the furnace?

The thermostat is the component responsible for controlling the temperature of the gas entering the furnace. It functions by sensing the ambient temperature of the space being heated and then sending a signal to the furnace when adjustments are needed. When the temperature drops below the set point on the thermostat, it prompts the furnace to ignite and start heating, allowing gas to flow into the burner assembly at the appropriate rate to maintain the desired temperature.

This control mechanism ensures that the gas entering the furnace is regulated based on the heating demands of the environment, thus maintaining comfort levels and preventing overheating. It plays a crucial role in the overall operation of the heating system by managing when and how much gas is utilized for combustion, which directly influences both efficiency and safety.