Woman reading on a couch

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

When your furnace is operating like it should, it should provide heat without making too much sound. While it’s normal to notice your furnace making noise as it turns on, other disruptions are showing your furnace needs immediate professional help.

Here are some of the most frequent furnace noises and what they might be signaling. If your furnace is making an atypical noise, our friendly heating professionals are here to help with the best furnace repair in Lexington.

1. Furnace Making a Banging Noise

You could have a critical problem on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it may mean there could be several problems. These involve gas increasing in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system turns dirty over time, so that’s why it’s important to schedule yearly furnace maintenance with James Heating & A/C, Inc. One of the things our techs perform during this service is clean your furnace’s burners. When this part gets dirty, you might hear your furnace making a loud rumbling noise if ignition takes longer than normal. The resulting gas buildup might crack your furnace’s heat exchanger, where natural gas transforms into warm air. Any breaks in it can discharge carbon monoxide, which is ordinarily vented outdoors. This hazardous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, James Heating & A/C, Inc recommends turning it off and calling us at 336-853-6070. Too much natural gas in your furnace or a fractured heat exchanger are hazardous troubles that should get immediate attention.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to move hot air throughout your residence. If the ductwork wasn’t installed correctly or is getting old, it can be loud when your furnace is heating. This can be the issue if your furnace makes a banging noise when it shuts off. Call James Heating & A/C, Inc at 336-853-6070 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace depends on an internal transformer to operate on the right voltage. If wires or the box needs to be tightened, you could hear a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends heated or cooled air across your home, and a capacitor, which triggers the motor. If either of these parts are going out, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be the result of something small, like an unfastened screw, or something major, like a broken component. In either case, we recommend shutting off your furnace and calling our heating professionals at 336-853-6070 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s trying to get your attention it could use some TLC. If you’ve neglected furnace maintenance the last couple of years, belts could be worn down or a bearing may need to be lubricated. We know that maintenance often slips your mind, but our pros can get your furnace operating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s frequently due to an air leak in your ductwork. You may also notice whistling while the furnace is working if a floor vent isn’t secure. If you’ve looked at your vents but are still noticing noise, James Heating & A/C, Inc can provide support. It’s critical to get loose ductwork fixed quickly, as it can create comfort troubles in your residence and inflate your gas costs.

6. Furnace Making a Grinding Noise

It’s not a good sign if you hear your furnace making a grinding noise. This metal-on-metal sound frequently means there’s trouble with your furnace’s blower. Shut down your furnace off now and reach our pros at 336-853-6070 for assistance.

When you’re hearing an atypical noise from your furnace, James Heating & A/C, Inc is ready to support you. Contact us at 336-853-6070 to request your furnace repair appointment now.

Back To Blog