What component in a furnace is responsible for ensuring airflow based on temperature settings?

The component in a furnace responsible for ensuring airflow based on temperature settings is the limit switch. The limit switch monitors the temperature within the furnace and serves as a safety device that prevents the furnace from overheating. When the temperature rises above a pre-set limit, the limit switch opens the circuit to the blower motor, causing it to either turn off or reduce its speed, thereby controlling the airflow through the system. This helps maintain safe operating temperatures and ensures that the furnace doesn't operate outside of its intended design parameters.

While various components contribute to the overall operation of heating and airflow within a furnace—such as the blower motor, gas valve, and thermostat—the limit switch plays a crucial role in regulating temperature and airflow based on those temperature settings, making it an essential part of the system's safety and functionality.