What can happen if a gas furnace operates with a clogged filter?

Operating a gas furnace with a clogged filter can lead to possible overheating. When the air filter becomes obstructed with dust and debris, it restricts airflow into the furnace. This limited airflow can cause the furnace to work harder to draw air, which increases the temperature within the system. If the heat exchanger overheats, it can lead to various issues, including damage to the furnace components or even a potential safety hazard such as a fire.

By ensuring that filters are clean and replaced regularly, you help maintain optimal airflow, which is crucial for the furnace's safe operation and efficiency. This highlights the importance of routine maintenance in gas furnace systems to prevent overheating and ensure longevity.