Woman reading on a couch

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

When your furnace is running correctly, it should give warmth without creating too much noise. While it’s common to catch your furnace making noise as it turns on, other sounds are showing your furnace needs immediate professional help.

Here are some of the most reported furnace noises and what they can be signaling. If your furnace is making a weird noise, our friendly heating specialists are here to help with the best furnace repair in Rochester.

1. Furnace Making a Banging Noise

You might have a critical issue on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it might mean there could be a few problems. These range from gas accumulating in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets grimy over time, so that’s why it’s essential to set seasonal furnace maintenance with Brogan Heating & AC Inc. One of the tasks our professionals do during this service is clean your furnace’s burners. When this component gets grimy, you might hear your furnace making a loud rumbling noise if ignition takes longer than normal. The subsequent gas buildup may fracture your furnace’s heat exchanger, where natural gas transforms into warm air. Any breaks in it can discharge carbon monoxide, which is regularly released outside. This dangerous gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Brogan Heating & AC Inc urges you to turn it off and contacting us at 507-218-0088. Excessive natural gas in your furnace or a ruptured heat exchanger are dangerous troubles that require fast attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to deliver warm air around your home. If the ductwork wasn’t designed right or is getting old, it can make a lot of noise when your furnace runs. This can be the problem if your furnace makes a banging noise when it shuts off. Call Brogan Heating & AC Inc at 507-218-0088 and we’ll pinpoint 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 usually indicates an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to run on the proper voltage. If wires or the box isn’t tight enough, you may hear a low humming noise in the furnace when off. Your furnace also uses a blower motor, which moves hot or cooled air around your rooms, and a capacitor, which turns on the motor. If either of these pieces are failing, 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 due to something minor, like an unfastened screw, or something major, like a broken component. In either case, we advise shutting your furnace off and contacting our heating professionals at 507-218-0088 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s attempting to alert you it needs some TLC. If you’ve forgotten furnace maintenance the past few years, belts could be worn out or a bearing may need to be lubricated. We are aware that maintenance sometimes slips your mind, but our pros can get your furnace heating 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 operating if a floor vent is loose. If you’ve checked your vents but are still hearing noise, Brogan Heating & AC Inc can assist you. It’s important to get loose ductwork fixed quickly, as it can result in comfort issues in your house and increase your utility bills.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you hear your furnace making a grinding noise. This metal-on-metal sound usually means there’s trouble with your furnace’s blower. Turn off your furnace off instantly and reach us at 507-218-0088 for help.

When you’re hearing an atypical noise from your furnace, Brogan Heating & AC Inc is available to support you. Contact us at 507-218-0088 to schedule your furnace repair appointment right away.

Back To Blog