What effect does a dirty air filter have on a gas furnace?

A dirty air filter significantly reduces the airflow within a gas furnace system. When the filter is obstructed by dust, debris, and other particulates, it hampers the efficient movement of air through the furnace and the ductwork. This restricted airflow can lead to several issues, one of which is overheating. As the furnace struggles to draw in enough air to operate correctly, the heat exchanger can become excessively hot. This situation not only affects the overall heating efficiency but can also activate safety features or lead to a breakdown of the furnace if the condition persists.

Maintaining clean air filters is crucial for optimal furnace performance, ensuring adequate airflow which keeps the furnace operating safely and efficiently. If filters are neglected, it can result in increased wear and tear, potentially leading to costly repairs or replacements down the line.