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

October 13, 2020

When your furnace is operating correctly, it should deliver warmth without generating too much sound. While it’s normal to notice your furnace making noise as it starts up, other sounds are indicating your furnace requires immediate professional help.

Here are some of the most common furnace noises and what they could be indicating. If your furnace is making an atypical noise, our friendly heating specialists are here to help with the best furnace repair in Huffman.

1. Furnace Making a Banging Noise

You could have an urgent issue on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it might signal there could be a few problems. These range from gas increasing in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes grimy over time, so that’s why it’s important to set annual furnace maintenance with Air Houston Mechanical LLC. One of the jobs our professionals do during this work is clean your furnace’s burners. When this piece gets grubby, you could hear your furnace making a loud rumbling noise after ignition is delayed. The resulting gas buildup may crack your furnace’s heat exchanger, where natural gas changes into warm air. Any cracks in it can leak carbon monoxide, which is ordinarily released away from your home. This dangerous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Air Houston Mechanical LLC urges you to turn it off and contacting us at 832-777-1521. Significant natural gas in your furnace or a cracked heat exchanger are dangerous problems that require immediate repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver heated air throughout your house. If the ductwork wasn’t put in correctly or is getting old, it can be loud when your furnace runs. This may be the issue if your furnace makes a banging noise when it shuts off. Contact Air Houston Mechanical LLC at 832-777-1521 and we’ll determine 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 is telling you there’s an electrical issue, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to work on the right voltage. If wires or the box needs to be tightened, you may hear a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes warm or cold air around your space, and a capacitor, which starts the motor. If either of these components 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 can be due to something small, like a loose screw, or something major, like a broken piece. In either case, we recommend shutting off your furnace and calling our heating pros at 832-777-1521 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 needs some TLC. If you’ve forgotten furnace maintenance the last couple of years, belts could be dilapidated or a bearing may need to be greased. We know that maintenance often slips your mind, but our pros can get your furnace operating quietly again rapidly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s typically due to an air leak in your ductwork. You may also notice whistling while the furnace is on if a floor vent is loose. If you’ve examined your vents but are still hearing whistling, Air Houston Mechanical LLC can help. It’s critical to get loose ductwork taken care of quickly, because it can make comfort problems in your home and increase your energy bills.

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 often means there’s a problem with your furnace’s blower. Turn off your furnace off immediately and contact us at 832-777-1521 for help.

When you’re getting an uncommon noise from your furnace, Air Houston Mechanical LLC is available to support you. Contact us at 832-777-1521 to schedule your furnace repair appointment right away.