When your furnace is running correctly, it should give warmth without generating too much noise. While it’s common to notice your furnace making noise as it starts up, other disruptions are indicating your furnace requires immediate professional assistance.

Here are some of the most reported furnace noises and what they can be signaling. If your furnace is making a strange noise, our friendly heating specialists are here to fix the problem with the best furnace repair in Lincoln, Nebraska.

1. Furnace Makes a Banging Sound

You may have an urgent situation on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it might signal there could be several problems. These include gas accumulating in your furnace or a ductwork problem.

Banging Sounds Coming from Your Furnace

Your heating system turns grimy over the years, so that’s why it’s critical to book seasonal furnace maintenance with AW Heating & Air Conditioning. One of the jobs our techs complete during this appointment is clean your furnace’s burners. When this piece gets grubby, you could hear your furnace making a loud rumbling noise when ignition takes longer than normal. The ensuing gas buildup can fracture your furnace’s heat exchanger, where natural gas turns into warm air. Any cracks in it can emit carbon monoxide, which is normally vented away from your home. This hazardous gas can be lethal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, AW Heating & Air Conditioning recommends turning it off and calling us at 402-438-7992. Significant natural gas in your furnace or a cracked heat exchanger are serious problems that should get immediate repairs.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to provide heated air throughout your house. If the ductwork wasn’t designed correctly or is getting dated, it can make a lot of noise when your furnace is heating. This could be the issue if your furnace makes a banging noise when it shuts off. Contact AW Heating & Air Conditioning at 402-438-7992 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

If you notice your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound typically 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 may detect a low humming noise in the furnace when off. Your furnace also has a blower motor, which moves warm or cooled air throughout your house, and a capacitor, which turns on the motor. If either of these pieces are fading, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be due to something small, like an unsecure screw, or something critical, like a broken part. In either case, we recommend shutting off your furnace and calling our heating pros at 402-438-7992 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 needs some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn out or a bearing might need to be lubed. We are aware that maintenance often slips your mind, but our techs can get your furnace operating quietly again quickly.

5. Furnace Making a Whistling Noise

When you’re noticing your furnace making a whistling noise, it’s likely 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 secure. If you’ve looked at your vents but are still sensing sound, AW Heating & Air Conditioning can provide support. It’s essential to get loose ductwork taken care of fast, as it can create comfort troubles in your home and drive up your heating bills.

6. Furnace Makes Noise that Sounds Like Scraping Metal

It’s not an encouraging sign if you notice your furnace making a grinding noise. This metal-on-metal noise often means there’s an issue with your furnace’s blower. Turn off your furnace off right away and reach our professionals at 402-438-7992 for help.

When you’re noticing an atypical noise from your furnace, AW Heating & Air Conditioning is here to support you. Contact us at 402-438-7992 to schedule your furnace repair appointment today.