Furnaces circulate a lot of air, so they’re bound to produce noise. However, any extremely loud or strange sounds, including popping, rattling, shrieking, or clicking, indicates that something is not functioning properly.
Inefficient furnaces may also begin to overproduce carbon dioxide, which leaves sooty residue around your air registers. This indicates you need to call us our furnace repair expert in Clifton Park for an inspection or for a new heater installation.