What is a common sign that a furnace may need repair?

A furnace that is functioning properly should operate quietly and maintain a consistent temperature throughout the home. Unusual noises, such as banging, clanking, or frequent cycling on and off, can indicate issues with components like the blower motor or the ignition system. These disturbances might signal mechanical wear or malfunction, which warrants a closer inspection and potential repair.

Temperature fluctuations—where different areas of the home experience varying levels of heat—can suggest a problem with the thermostat, ductwork, or the furnace itself. These fluctuations can create an uncomfortable living environment and are clear indicators that maintenance or repair work may be necessary to restore the system's efficiency and performance.

In contrast, consistent temperature maintenance, a decrease in fuel usage, and increased airflow generally indicate that a furnace is operating effectively. These factors do not suggest issues that would lead to repairs.