When your furnace is running like it should, it should give heat without making too much noise. While it’s common to hear your furnace making noise as it starts up, other noises are showing your furnace should get immediate professional assistance.

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

1. Furnace Makes a Banging Sound

You may 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 involve gas accumulating in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy over the years, so that’s why it’s critical to book seasonal furnace maintenance with B & B Heating & Cooling. One of the things our professionals perform during this appointment is clean your furnace’s burners. When this part gets grubby, you may hear your furnace making a loud rumbling noise after ignition is delayed. The subsequent gas buildup might break your furnace’s heat exchanger, where natural gas transforms into warm air. Any cracks in it can leak carbon monoxide, which is normally emitted outdoors. This hazardous gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, B & B Heating & Cooling advises turning it off and contacting us at 314-325-7552. Excessive natural gas in your furnace or a fractured heat exchanger are dangerous issues that should get immediate attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move heated air throughout your home. If the ductwork wasn’t installed properly or is getting dated, it can make a lot of noise when your furnace is on. This could be the issue if your furnace makes a banging noise when it shuts off. Contact B & B Heating & Cooling at 314-325-7552 and we’ll pinpoint 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 means there’s an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to run on the correct voltage. If wires or the box needs to be tightened, you may detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends heated or cold air throughout your space, and a capacitor, which triggers the motor. If either of these pieces are failing, they will buzz when the furnace turns on.

3. Furnace Makes Rattling Sounds Like Something Is Loose

If your furnace is making a rattling noise, it may be due to something minor, like a loose screw, or something critical, like a broken piece. In either case, we urge you to shut your furnace off and getting in touch with our heating pros at 314-325-7552 for help.

4. Furnace Squeals

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s trying to get your attention it could use some TLC. If you’ve skipped furnace maintenance the past few years, belts could be worn out or a bearing might need to be greased. We are aware that maintenance often slips your mind, but our technicians can get your furnace running quietly again fast.

5. Furnace Whistles

When you’re hearing your furnace making a whistling noise, it’s likely due to an air leak in your ductwork. You could also be aware of whistling while the furnace is working if a floor vent is loose. If you’ve examined your vents but are still noticing noise, B & B Heating & Cooling can assist you. It’s important to get loose ductwork repaired quickly, because it can make comfort troubles in your house and drive up your utility expenses.

6. Furnace Makes a Loud, Unpleasant Grinding Noise

It’s not a positive sign if you notice your furnace making a grinding noise. This metal-on-metal racket usually means there’s trouble with your furnace’s blower. Switch off your furnace off now and reach our professionals at 314-325-7552 for help.

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