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Banging, Screeching and Rattling: What 6 Typical Furnace Noises Mean

When your furnace is working properly, it should give warm air without creating too much sound. While it’s normal to notice your furnace making noise as it starts up, other sounds are showing your furnace should get immediate professional help.

Here are some of the most common furnace noises and what they can mean. If your furnace is making a weird noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Tucker.

1. Furnace Making a Banging Noise

You might have a serious issue on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it may indicate there could be a few problems. These include gas increasing in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty over time, so that’s why it’s critical to set yearly furnace maintenance with ACS Heating and Air Conditioning. One of the tasks our techs perform during this appointment is clean your furnace’s burners. When this part gets grubby, you may hear your furnace making a loud rumbling noise after ignition takes more time. The resulting gas buildup might crack your furnace’s heat exchanger, where natural gas changes into warm air. Any breaks in it can discharge carbon monoxide, which is normally released outside. This dangerous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, ACS Heating and Air Conditioning recommends turning it off and calling us at 770-450-1539. Excessive natural gas in your furnace or a fractured heat exchanger are critical troubles that require immediate repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to deliver hot air around your house. If the ductwork wasn’t installed correctly or is getting dated, it can be loud when your furnace is on. This may be the case if your furnace makes a banging noise when it shuts off. Contact ACS Heating and Air Conditioning at 770-450-1539 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound typically indicates an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to run on the proper voltage. If wires or the box isn’t tight enough, you might detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which sends hot or cold air throughout your rooms, and a capacitor, which triggers the motor. If either of these pieces are fading, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it might be the result of something minor, like a loose screw, or something critical, like a broken part. In either case, we recommend shutting off your furnace and calling our heating specialists at 770-450-1539 for help.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to tell you it requires some TLC. If you’ve neglected furnace maintenance the past few years, belts could be worn down or a bearing might need to be lubricated. We are aware that maintenance frequently slips your mind, but our technicians can get your furnace running quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s typically due to an air leak in your ductwork. You could also be aware of whistling while the furnace is working if a floor vent isn’t secure. If you’ve examined your vents but are still sensing noise, ACS Heating and Air Conditioning can help. It’s critical to get loose ductwork fixed without delay, since it can create comfort problems in your home and increase your gas costs.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you detect your furnace making a grinding noise. This metal-on-metal racket frequently means there’s trouble with your furnace’s blower. Shut down your furnace off immediately and contact our pros at 770-450-1539 for assistance.

When you’re hearing a strange noise from your furnace, ACS Heating and Air Conditioning is available to provide assistance. Contact us at 770-450-1539 to book your furnace repair appointment right away.

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