Banging, Screeching and Rattling: What 6 Typical Furnace Noises Indicate

October 13, 2020

When your furnace is operating like it should, it should provide warm air without creating too much sound. While it’s normal to notice your furnace making noise as it begins running, other noises are indicating your furnace requires immediate professional support.

Here are some of the most reported furnace noises and what they can be indicating. If your furnace is making an odd noise, our friendly heating professionals are here to fix the problem with the best furnace repair in Huntsville, AL.

1. Furnace Making a Banging Noise

You could have a serious issue on your hands if you’re hearing your furnace making a banging noise. If your furnace is making a knocking noise, it might indicate there could be several problems. These involve gas accumulating in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system gets filthy over the years, so that’s why it’s critical to book routine furnace maintenance with All Weather Heating & Air Conditioning Inc. One of the things our pros complete during this appointment is clean your furnace’s burners. When this component gets grubby, you might hear your furnace making a loud rumbling noise if ignition takes more time. The resulting gas buildup might crack your furnace’s heat exchanger, where natural gas changes into heat. Any cracks in it can emit carbon monoxide, which is ordinarily emitted outdoors. This dangerous gas can be lethal in large concentrations.

If you’re aware of banging or knocking sounds coming from your furnace, All Weather Heating & Air Conditioning Inc recommends turning it off and calling us at 256-801-4701. Excessive natural gas in your furnace or a fractured heat exchanger are dangerous troubles that necessitate prompt repairs.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to provide hot air across your home. If the ductwork wasn’t designed correctly or is getting old, it can be noisy when your furnace runs. This may be the issue if your furnace makes a banging noise when it shuts off. Call All Weather Heating & Air Conditioning Inc at 256-801-4701 and we’ll pinpoint the problem.

2. Furnace Making a Buzzing Noise

If you notice your furnace making a buzzing noise, don’t delay calling us. A buzzing sound typically is telling you there’s an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to operate on the proper voltage. If wires or the box isn’t tight enough, you may detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes warm or chilly air across your residence, and a capacitor, which turns on the motor. If either of these components are fading, they will buzz when the furnace switches on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it can be the result of something small, like an unsecure screw, or something major, like a broken component. In either case, we advise shutting your furnace off and contacting our heating professionals at 256-801-4701 for support.

4. Furnace Making a Squealing Noise

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 skipped furnace maintenance the past few years, belts could be worn out or a bearing might need to be greased. We realize that maintenance often slips your mind, but our pros 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 might also hear whistling while the furnace is on if a floor vent is loose. If you’ve checked your vents but are still hearing noise, All Weather Heating & Air Conditioning Inc can assist you. It’s important to get loose ductwork fixed without delay, since it can make comfort troubles in your home and inflate your energy costs.

6. Furnace Making a Grinding Noise

It’s not a good sign if you hear your furnace making a grinding noise. This metal-on-metal noise usually means there’s a problem with your furnace’s blower. Turn off your furnace off right away and reach our pros at 256-801-4701 for support.

When you’re getting an atypical noise from your furnace, All Weather Heating & Air Conditioning Inc is here to support you. Contact us at 256-801-4701 to book your furnace repair appointment today.