When your furnace is running properly, it should give warm air without generating too much noise. While it’s expected to hear your furnace making noise as it begins running, other noises are signaling your furnace needs immediate professional assistance.

Here are some of the most frequent furnace noises and what they might be indicating. If your furnace is making an odd noise, our friendly heating pros are here to help with the best furnace repair in Florissant and St. Charles, Missouri.

1. Furnace Makes Banging or Knocking Sounds

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

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 B & B Heating & Cooling. One of the jobs our technicians do during this appointment is clean your furnace’s burners. When this component gets dirty, you could hear your furnace making a loud rumbling noise after ignition takes longer than normal. The subsequent gas buildup can crack your furnace’s heat exchanger, where natural gas turns into warm air. Any breaks in it can emit carbon monoxide, which is regularly emitted outdoors. This dangerous gas can be deadly in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, B & B Heating & Cooling advises turning it off and reaching us at 314-325-7552. Too much natural gas in your furnace or a cracked heat exchanger are serious issues that necessitate fast service.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to deliver warm air around your house. If the ductwork wasn’t put in properly or is getting dated, it can make a lot of noise when your furnace is heating. This can be the problem if your furnace makes a banging noise when it shuts off. Call B & B Heating & Cooling at 314-325-7552 and we’ll figure out the problem.

2. Furnace Makes a Buzzing Sound

If you observe your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound usually indicates 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 needs to be tightened, you may notice a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes heated or chilly air throughout your home, and a capacitor, which turns on the motor. If either of these components 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 can be related to something minor, like a loose screw, or something critical, like a broken piece. In either case, we recommend shutting off your furnace and contacting our heating pros at 314-325-7552 for help.

4. Furnace Is Making a High-Pitched Squealing Sound

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 neglected furnace maintenance the past few years, belts could be worn out or a bearing may need to be greased. We know that maintenance often slips your mind, but our technicians can get your furnace operating quietly again rapidly.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re detecting your furnace making a whistling noise, it’s frequently because of an air leak in your ductwork. You may also be aware of whistling while the furnace is running if a floor vent isn’t tight. If you’ve looked at your vents but are still sensing whistling, B & B Heating & Cooling can help. It’s essential to get loose ductwork fixed fast, as it can create comfort issues in your house and inflate 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 noise often means there’s a problem with your furnace’s blower. Shut down your furnace off now and call our professionals at 314-325-7552 for support.

When you’re noticing an atypical noise from your furnace, B & B Heating & Cooling is ready to support you. Contact us at 314-325-7552 to book your furnace repair appointment today.