Someday, in perhaps not the too far off future, there may be an HVAC system that doesn’t make any noise at all. We can’t promise this will be a reality, but chances are manufacturers will be able to get pretty close.
For now, though, you’re going to hear your furnace make some noise at it runs. For example, you may hear the gentle rattling of your ductwork as the temperature inside them fluctuates. You’ll hear the system cycling on and off, and the whoosh of air coming through your vents.
Noise can actually be a good thing, though, because when a sound becomes different, or when you hear a noise you never have before, then you know something is wrong, and you can watch for silent furnace problems!
What kinds of furnace noises signal it’s time to call a professional?
- Clanking (metal‑on‑metal sounds): Often means the blower wheel is damaged or misaligned.
- Screeching: Indicates a worn or failing blower motor, possibly needing lubrication or replacement.
- Heavy rattling: Loose parts or a cracked heat exchanger, which can leak carbon monoxide, may be to blame.
- Banging or booming: Caused by dirty burners igniting too rapidly or delayed combustion; can stress the furnace structure.
Read on as we uncover 4 common noises that indicate it’s time to schedule furnace repair or replacement.