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Sounds You Should Never Hear Your Heater Making

woman-covering-her-ears-It can be easy to ignore some of the noises coming from your heater. After all, there is no such thing as a completely silent heating system, and in the everyday hustle and bustle of life, it can be easy to ignore a small rattle or weird grinding noise.

We really have to discourage you from neglecting strange noises, though. You’ll regularly hear your ductwork fluctuating with temperature changes, and you’ll hear your system start up and shut down. You’ll also hear the air whooshing through your vents. Any other noise coming from your furnace or heating system should be cause for alarm. For instance, call us if you hear:


A loud screeching noise is very often a sign that the blower motor of your furnace or heat pump isn’t working as it should. And a blower motor in disrepair means that the heat generated by your furnace won’t be able to circulate warm air around your home as successfully as it should. This may just mean that the blower motor is in desperate need of lubrication, but it may also suggest that the fan has stopped working as it should altogether. In order to properly diagnose the problem, it’s important that a professionally trained and experienced HVAC technician visits your home. Once the problem is diagnosed, they can advise you on the next steps.


Do you hear something that resembles the sound of metal-on-metal? Then that is probably exactly what you’re hearing. It could be that the heater’s blower wheel or some other important component has become loose. If this is the case, you must turn off your furnace and contact a pro right away to prevent further damage to the wheel or another component that’s become loose. More damage to your heater means more cost for you to incur.


Often described as banging by some homeowners, booming is most often a sign of a dirty burner. This can be a very hazardous problem. The noise you’re hearing here is caused by a delay in ignition due to dirt and buildup. The gas builds up, and when it ignites, a small explosion occurs inside your furnace.

This sounds dangerous enough, right? But it’s not actually the explosion itself you need to worry about, but rather what the explosion leads to. It causes your heat exchanger to rattle, and then potentially crack. Cracked heat exchangers allow gas—namely, carbon monoxide—to leak into your living space.

Carbon monoxide can not only make people ill but in severe cases can even be fatal. If you think you hear booming coming from your gas-powered heating system, you should shut off the system right away and call in the pros!


Rattling is another one of those noises that can be the sign of something very minor or a much larger and more serious problem. The best thing you can do if you hear rattling coming from your heater is give our pros a call.

Cool Sunshine Heating and Air Conditioning, Inc. has been serving the Metro Denver area since 1997. We are one big happy family, and we’d like you to become a part of it! Contact us today for custom HVAC services, reliable heating repair in Littleton, CO and more.

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