When your furnace is running properly, it should provide warm air without generating too much noise. While it’s expected to notice your furnace making noise as it starts up, other disruptions are signaling your furnace requires immediate professional support.

Here are some of the most common furnace noises and what they could be signaling. If your furnace is making a weird noise, our friendly heating pros are here to help with the best furnace repair in Marshalltown, Iowa.

1. Furnace Makes a Banging Sound

You could have an urgent issue on your hands if you’re noticing your furnace making a banging noise. If your furnace is making a knocking noise, it may mean there could be a couple of problems. These include gas building up in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system turns filthy over time, so that’s why it’s important to set seasonal furnace maintenance with B & G HVAC. One of the jobs our techs do during this appointment is clean your furnace’s burners. When this piece gets grubby, you could hear your furnace making a loud rumbling noise if ignition is delayed. The resulting gas buildup may fracture your furnace’s heat exchanger, where natural gas turns into warmth. Any cracks in it can leak carbon monoxide, which is ordinarily released away from your home. This dangerous gas can be deadly in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, B & G HVAC urges you to turn it off and contacting us at 641-316-3360. Significant natural gas in your furnace or a broken heat exchanger are hazardous troubles that necessitate fast service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to provide hot air throughout your home. If the ductwork wasn’t designed right or is getting old, it can be loud when your furnace is on. This may be the issue if your furnace makes a banging noise when it shuts off. Contact B & G HVAC at 641-316-3360 and we’ll pinpoint the problem.

2. Furnace Makes a Buzzing Sound

If you notice your furnace making a buzzing noise, don’t wait to call us. A buzzing sound often indicates an electrical issue, 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 might hear a low humming noise in the furnace when off. Your furnace also uses a blower motor, which distributes heated or cooled air across your space, and a capacitor, which starts the motor. If either of these pieces are failing, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be the result of something little, like an unsecure screw, or something critical, like a broken component. In either case, we urge you to shut your furnace off and contacting our heating pros at 641-316-3360 for support.

4. Furnace Squeals

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s trying to alert you it could use some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn out or a bearing might need to be greased. We know that maintenance sometimes slips your mind, but our technicians can get your furnace running quietly again fast.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re noticing your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You might also hear whistling while the furnace is running if a floor vent isn’t secure. If you’ve checked your vents but are still hearing whistling, B & G HVAC can help. It’s critical to get loose ductwork repaired quickly, as it can result in comfort problems in your home and inflate your energy expenses.

6. Furnace Makes Noise that Sounds Like Scraping Metal

It’s not a good sign if you detect your furnace making a grinding noise. This metal-on-metal sound often means there’s an issue with your furnace’s blower. Switch off your furnace off immediately and contact us at 641-316-3360 for support.

When you’re hearing a weird noise from your furnace, B & G HVAC is available to help. Contact us at 641-316-3360 to schedule your furnace repair appointment now.