When your furnace is running properly, it should deliver warm air without making too much noise. While it’s normal to hear your furnace making noise as it starts up, other sounds are showing your furnace should get immediate professional assistance.

Here are some of the most reported furnace noises and what they can be indicating. If your furnace is making a strange noise, our friendly heating professionals are here to assist with the best furnace repair in Florissant and St. Charles, Missouri.

1. Furnace Making a Banging Noise

You may have a serious situation on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it may indicate there could be several problems. These involve gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy over time, so that’s why it’s critical to book yearly furnace maintenance with B & B Heating & Cooling. One of the tasks our techs complete during this appointment is clean your furnace’s burners. When this part gets grubby, you could hear your furnace making a loud rumbling noise when ignition takes longer than normal. The following gas buildup can fracture your furnace’s heat exchanger, where natural gas changes into warmth. Any breaks in it can emit carbon monoxide, which is normally emitted outdoors. This hazardous gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, B & B Heating & Cooling urges you to turn it off and reaching us at 314-325-7552. Excessive natural gas in your furnace or a cracked heat exchanger are critical issues that should get immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to deliver hot air around your residence. If the ductwork wasn’t designed properly or is getting dated, it can make a lot of noise when your furnace runs. This might be the case if your furnace makes a banging noise when it shuts off. Get in touch with B & B Heating & Cooling at 314-325-7552 and we’ll figure out 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 means there’s an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to work on the correct voltage. If wires or the box needs to be tightened, you could detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes warm or chilly air throughout your rooms, and a capacitor, which starts the motor. If either of these parts are fading, they will buzz when the furnace switches on.

3. Furnace Rattles

If your furnace is making a rattling noise, it could be the result of something small, like an unsecure screw, or something major, like a broken component. In either case, we urge you to shut your furnace off and contacting our heating specialists at 314-325-7552 for assistance.

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 trying to alert you it could use some TLC. If you’ve neglected furnace maintenance the last couple of years, belts could be worn out or a bearing might need to be lubed. We realize that maintenance frequently slips your mind, but our technicians can get your furnace running quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s typically because of an air leak in your ductwork. You could 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 hearing noise, B & B Heating & Cooling can help. It’s essential to get loose ductwork fixed fast, as it can make comfort problems in your house and drive up your heating costs.

6. Furnace Makes Noise that Sounds Like Scraping Metal

It’s not an encouraging sign if you hear your furnace making a grinding noise. This metal-on-metal sound usually means there’s an issue with your furnace’s blower. Turn off your furnace off right away and reach our professionals at 314-325-7552 for support.

When you’re getting a strange noise from your furnace, B & B Heating & Cooling is here to provide assistance. Contact us at 314-325-7552 to schedule your furnace repair appointment now.