HVAC Furnace gas valves control the flow of gas to the burners in a furnace or boiler. It regulates the amount of gas that is supplied to the combustion chamber, which in turn controls the heating output of the system. The gas valve is typically controlled by a thermostat or other control device, which signals the valve to open or close based on the temperature set point and the current room temperature.

The furnace gas valve plays a critical role in ensuring the safe and efficient operation of the HVAC system. It prevents the flow of gas when the system is not in use, and regulates the flow when the system is running to ensure that the correct amount of heat is produced. A faulty gas valve can cause a number of problems, including decreased heating efficiency, increased fuel consumption, and even the risk of carbon monoxide leaks.