Woman reading on a couch

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

When your furnace is working properly, it should provide heat without creating too much disruption. While it’s normal to hear your furnace making noise as it starts up, other disruptions are showing your furnace needs immediate professional help.

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

1. Furnace Making a Banging Noise

You could have a critical problem on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it can signal there could be a couple of problems. These range from gas increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets grimy as time passes, so that’s why it’s important to book routine furnace maintenance with Banister's Heating & Air Conditioning Services. One of the things our technicians do during this work is clean your furnace’s burners. When this piece gets grimy, you may hear your furnace making a loud rumbling noise after ignition takes more time. The ensuing gas buildup may fracture your furnace’s heat exchanger, where natural gas turns into heat. Any cracks in it can discharge carbon monoxide, which is normally released outdoors. This dangerous gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Banister's Heating & Air Conditioning Services urges you to turn it off and contacting us at 575-446-3948. Significant natural gas in your furnace or a cracked heat exchanger are serious problems that should get fast service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to provide warm air across your residence. If the ductwork wasn’t installed properly or is aging, it can be noisy when your furnace is on. This might be the problem if your furnace makes a banging noise when it shuts off. Call Banister's Heating & Air Conditioning Services at 575-446-3948 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

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

Your furnace relies on an internal transformer to run on the right voltage. If wires or the box is loose, you could hear a low humming noise in the furnace when off. Your furnace also uses a blower motor, which sends warm or cooled air across your rooms, and a capacitor, which turns on the motor. If either of these components are going out, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be the result of something small, like an unsecure screw, or something critical, like a broken part. In either case, we recommend shutting off your furnace and calling our heating pros at 575-446-3948 for assistance.

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 could use some TLC. If you’ve forgotten furnace maintenance the past few years, belts could be dilapidated or a bearing could need to be lubricated. We realize that maintenance sometimes slips your mind, but our technicians can get your furnace operating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s likely the result of an air leak in your ductwork. You may also hear whistling while the furnace is operating if a floor vent isn’t secure. If you’ve looked at your vents but are still sensing noise, Banister's Heating & Air Conditioning Services can help. It’s critical to get loose ductwork repaired quickly, as it can create comfort issues in your home and increase your utility bills.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you hear your furnace making a grinding noise. This metal-on-metal sound frequently means there’s a problem with your furnace’s blower. Switch off your furnace off right away and contact us at 575-446-3948 for assistance.

When you’re hearing an atypical noise from your furnace, Banister's Heating & Air Conditioning Services is available to support you. Contact us at 575-446-3948 to request your furnace repair appointment now.

Back To Blog