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Proudly Serving The Columbia Area Since 1985


Fulmer Heating & Cooling Blog

Sounds That No Heater Should Make


When you run your heater, have you ever taken the time to figure out what it sounds like? Probably not. Most people don’t mull over the sounds that their heater makes on a regular basis. What they do not have though is when that same heater starts to sound different.

Modern heaters aren’t able to run silently, let’s make that clear now. That said, there are plenty of noises you shouldn’t hear your heating system make. If you notice odd noises from yours, it may mean you need a technician to come to check things out.

Here are some of the sounds you never want to hear from your Lexington, SC heating system.


You turn on your heater and almost immediately cringe at the sound of a higher-pitch screeching noise. It is highly unpleasant and it also means trouble for your heater’s wellbeing. Screeching is usually caused by metal scraping against metal, such as when you have a dry motor belt or an off-kilter fan blade scraping around its housing.


Have a gas furnace? Then you need to take note of this noise. It is hard not to since the sound of a small explosion from your heater would grab almost anyone’s attention. Booming indicates a delay in the ignition of the gas in your system. Make sure to address this noise before it creates bigger problems in your heater!


Does it sound like something is shaking in your heater? When you hear rattling, it is likely that you really are hearing something being shaken in your system. Loose nuts, bolts, or screws may be the cause of this sound. Likewise, it can also be a good idea to check that your blower door is closed properly as a loose one can also create this sound.


Don’t mistake this for the usual whoosh of air from your heater. Hissing is far more problematic. In a heat pump, hissing can indicate that you have a refrigerant leak in your system which will create big issues if not repaired quickly. If you have a gas furnace and you hear hissing along with the smell of rotten eggs, turn the system off and call for emergency services because it is more than likely you have a cracked heat exchanger that is allowing gas to enter your home.

Buzzing or Humming

Hearing some buzz or vibrate in your heater? Check your filter first to see if it needs to be changed. If this doesn’t resolve the issue, reach out to a professional. Buzzing or humming can be caused by electrical problems that will worsen with time.

When Something Sounds Wrong, Reach Out To Us

Concerning noises are just some of the indicators of trouble with your heater. Make sure to check in on your other senses too, such as smell and sight. For example, smelling dirty socks or seeing dirty air when running your heater are also instances when it is a good idea to reach out to a professional for help.

Don’t hesitate to contact Fulmer Heating & Cooling for all your home comfort services.

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