What component senses room temperature and controls the furnace operation?

The component that senses room temperature and controls furnace operation is the thermostat. This device monitors the ambient temperature in the space and communicates with the furnace to maintain the desired temperature set by the user. When the temperature drops below the set point, the thermostat sends a signal to the furnace to activate, thereby ensuring the room is heated effectively. It plays a crucial role in regulating the comfort level within a space by allowing for automatic adjustments based on temperature readings.

In contrast, the gas valve is responsible for regulating the flow of gas to the burners but does not have the capability to sense or adjust based on room temperature. The blower motor is used to circulate heated air throughout the home but does not control the heating system directly. The combustion air vent is important for ensuring that adequate air is supplied for combustion but, similar to the gas valve and blower motor, does not function in sensing or controlling room temperature.