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Banging, Screeching and Rattling: What 6 Common Furnace Noises Indicate

When your furnace is working correctly, it should provide heat without creating too much noise. While it’s expected to notice your furnace making noise as it starts up, other sounds are showing your furnace should get immediate professional assistance.

Here are some of the most reported furnace noises and what they can be signaling. If your furnace is making a strange noise, our friendly heating professionals are here to assist with the best furnace repair in Rapid City.

1. Furnace Making a Banging Noise

You might have an urgent issue on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it can indicate there could be several problems. These range from gas building up in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty over time, so that’s why it’s critical to schedule routine furnace maintenance with Street Heating and Cooling. One of the jobs our technicians do during this work is clean your furnace’s burners. When this part gets dirty, you could hear your furnace making a loud rumbling noise when ignition takes longer than normal. The subsequent gas buildup can fracture your furnace’s heat exchanger, where natural gas changes into heat. Any fractures in it can emit carbon monoxide, which is normally vented away from your home. This dangerous gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Street Heating and Cooling recommends turning it off and reaching us at 605-206-3915. Excessive natural gas in your furnace or a broken heat exchanger are critical problems that should get prompt attention.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to provide heated air throughout your residence. If the ductwork wasn’t designed right or is getting old, it can be noisy when your furnace is heating. This may be the issue if your furnace makes a banging noise when it shuts off. Contact Street Heating and Cooling at 605-206-3915 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

If you hear your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound often is telling you there’s an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to operate on the proper voltage. If wires or the box needs to be tightened, you could notice a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes hot or chilly air around your house, and a capacitor, which triggers the motor. If either of these parts are fading, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be related to something little, like an unsecure screw, or something critical, like a broken component. In either case, we recommend shutting off your furnace and getting in touch with our heating professionals at 605-206-3915 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s trying to get your attention it requires some TLC. If you’ve skipped furnace maintenance the past few years, belts could be worn down or a bearing could need to be greased. We are aware that maintenance sometimes slips your mind, but our professionals can get your furnace running quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s likely the result of an air leak in your ductwork. You might also notice whistling while the furnace is on if a floor vent isn’t secure. If you’ve examined your vents but are still noticing noise, Street Heating and Cooling can provide support. It’s essential to get loose ductwork fixed fast, because it can result in comfort problems in your house and inflate your heating bills.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you notice your furnace making a grinding noise. This metal-on-metal sound usually means there’s a problem with your furnace’s blower. Turn off your furnace off right away and call our pros at 605-206-3915 for help.

When you’re hearing a weird noise from your furnace, Street Heating and Cooling is ready to support you. Contact us at 605-206-3915 to book your furnace repair appointment now.

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