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Serving the Southern California Area



Serving the Southern California Area


Smart Choice Heating and Air Blog

Sounds You Don’t Want Your Furnace Making


We get it—it can be easy to ignore some of the noises that the appliances and fixtures in your home make—especially when they’re not particularly loud or alarming. It’s human nature to deny that something is wrong because fixing it can be an expensive hassle. But we’re here to tell you that there are certain furnace noises you never want to ignore.

While a rattle, for example, might just indicate a loose panel, it may also suggest a cracked heat exchanger, which can lead to a hazardous carbon monoxide leak. We know how important it is to you to protect your home and your family, so if you hear the following suspicious noises coming from your furnace, then please don’t hesitate to give us a call.


A loud screeching noise is very likely a sign that the blower motor in your furnace isn’t working as it should. A failing blower motor means that the heat produced by your furnace won’t’ be able to circulate warm air around your living space successfully.

This may mean that the blower motor simply needs lubrication. However, it can also suggest that the fan has stopped altogether. To properly diagnose the problem, it’s important that a local HVAC technician checks it out. Once the problem is professionally diagnosed, we can advise you on the next best steps to take.


Do you hear something that resembles metal on metal as your furnace runs? Then that is probably exactly what you’re hearing, and it could be the sign of a serious problem with your furnace’s blower wheel. If this is indeed what’s happening, you’ll need to turn off your furnace and contact a pro right away to prevent further damage to the wheel.

More damage to the wheel means more damage to your wallet, after all.

Banging or Booming

Usually, the bang or boom you may hear coming from your furnace as it starts up is indicative of a dirty burner. This can be hazardous! The sound you hear is caused by a delay in the ignition, because of dirt and grime buildup. The gas builds up as a result, and when the burner ignites, a small explosion occurs inside your furnace.

Cleaning the burners isn’t something we recommend homeowners attempt on their own. There’s too much room for error, and you don’t need to spend more money in the long run. It’s always after to call in a pro, particularly when dealing with gas lines.


Rattling doesn’t exactly seem like a threatening sound, right? Well, if you hear this coming from your furnace, you certainly shouldn’t ignore it or assume it’s nothing but a loose panel or screw. A broken or cracked heat exchanger can be the cause of this noise.

It may be something more simple like a lack of airflow from dirty filters or issues with your blower, but you won’t know for sure until you have a pro investigate, and potentially damaged heat exchangers are nothing to wait on.

For expert furnace repair Anaheim, CA, contact Smart Choice Heating and Air! Dedicated to Great Service, Clean Air & Happy Homes.

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