When your furnace is running properly, it should provide heat without generating too much disruption. While it’s expected to catch your furnace making noise as it begins running, other sounds are indicating your furnace needs immediate professional help.

Here are some of the most common furnace noises and what they could mean. If your furnace is making an odd noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Jefferson, Wisconsin.

1. Furnace Makes a Banging Sound

You might 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 can mean there could be a few problems. These include gas building up in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system turns filthy over time, so that’s why it’s essential to book annual furnace maintenance with Pratt Brothers. One of the things our pros do during this appointment is clean your furnace’s burners. When this part gets dirty, you may hear your furnace making a loud rumbling noise after ignition takes longer than normal. The following gas buildup may break your furnace’s heat exchanger, where natural gas transforms into heat. Any cracks in it can discharge carbon monoxide, which is ordinarily emitted away from your home. This toxic gas can be fatal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, Pratt Brothers advises turning it off and contacting us at 920-347-8495. Significant natural gas in your furnace or a broken heat exchanger are hazardous problems that should get prompt service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to deliver warm air throughout your residence. If the ductwork wasn’t installed properly or is getting dated, it can be loud when your furnace is heating. This might be the issue if your furnace makes a banging noise when it shuts off. Call Pratt Brothers at 920-347-8495 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 typically is telling you there’s an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to operate on the correct 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 warm or cold air across your space, and a capacitor, which turns on the motor. If either of these pieces are fading, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it could be related to something minor, like an unfastened screw, or something major, like a broken part. In either case, we recommend shutting off your furnace and getting in touch with our heating specialists at 920-347-8495 for help.

4. Furnace Is Making a High-Pitched Squealing Sound

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s attempting to tell you it needs some TLC. If you’ve neglected furnace maintenance recently, belts could be worn out or a bearing could need to be lubed. We know that maintenance sometimes slips your mind, but our professionals can get your furnace heating quietly again fast.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re hearing 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 working if a floor vent isn’t secure. If you’ve examined your vents but are still sensing sound, Pratt Brothers can provide support. It’s essential to get loose ductwork taken care of fast, because it can make comfort troubles in your home and inflate your heating expenses.

6. Furnace Makes Noise that Sounds Like Scraping Metal

It’s not a positive sign if you notice your furnace making a grinding noise. This metal-on-metal sound typically means there’s a problem with your furnace’s blower. Turn off your furnace off promptly and call our professionals at 920-347-8495 for support.

When you’re getting a weird noise from your furnace, Pratt Brothers is here to support you. Contact us at 920-347-8495 to request your furnace repair appointment now.