Remy Froissart, CNRS

When temperatures drop, furnace repair concerns usually involve ignition, airflow, or safety controls. Signs to watch include unusual noises, burning smells that do not fade quickly, short cycling, or a furnace that runs but does not heat evenly.(Image: https://www.mantripping.com/images/stories/ac-repair-what-men-need-to-know/air-conditioner-repair-man-fixing-the-condensor-unit.png) A maintenance visit can include inspecting burners, verifying safe operation, and testing key components.