Woman reading on a couch

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

When your furnace is working correctly, it should give heat without making too much disruption. While it’s expected to notice your furnace making noise as it turns on, other noises are indicating your furnace requires immediate professional help.

Here are some of the most common furnace noises and what they could be indicating. If your furnace is making a weird noise, our friendly heating specialists are here to assist with the best furnace repair in Carpentersville.

1. Furnace Making a Banging Noise

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

Banging Sounds Coming from Your Furnace

Your heating system turns dirty over the years, so that’s why it’s critical to book yearly furnace maintenance with Controlled Comfort HVAC Inc. One of the jobs our pros complete during this appointment is clean your furnace’s burners. When this component gets dirty, you could hear your furnace making a loud rumbling noise when ignition is delayed. The resulting gas buildup may crack your furnace’s heat exchanger, where natural gas transforms into heat. Any cracks in it can leak carbon monoxide, which is ordinarily vented outdoors. This hazardous gas can be lethal in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Controlled Comfort HVAC Inc recommends turning it off and calling us at 224-412-8308. Significant natural gas in your furnace or a cracked heat exchanger are critical troubles that necessitate prompt attention.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to provide warm air across your residence. If the ductwork wasn’t put in correctly or is getting old, it can be loud when your furnace is heating. This can be the problem if your furnace makes a banging noise when it shuts off. Call Controlled Comfort HVAC Inc at 224-412-8308 and we’ll determine the problem.

2. Furnace Making a Buzzing Noise

If you hear your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound often indicates 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 is loose, you might detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes heated or chilly air around your house, and a capacitor, which triggers the motor. If either of these components are failing, they will buzz when the furnace turns on.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be related to something minor, like an unsecure screw, or something critical, like a broken piece. In either case, we recommend shutting off your furnace and getting in touch with our heating pros at 224-412-8308 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s on, it’s making an effort to alert you it needs some TLC. If you’ve neglected furnace maintenance the last couple of years, belts could be worn down or a bearing could need to be lubricated. We know that maintenance often slips your mind, but our techs can get your furnace operating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re hearing your furnace making a whistling noise, it’s frequently the result of an air leak in your ductwork. You may also notice whistling while the furnace is working if a floor vent isn’t tight. If you’ve looked at your vents but are still sensing sound, Controlled Comfort HVAC Inc can assist you. It’s essential to get loose ductwork repaired fast, as it can create comfort problems in your home and increase your gas bills.

6. Furnace Making a Grinding Noise

It’s not a good sign if you notice your furnace making a grinding noise. This metal-on-metal noise usually means there’s a problem with your furnace’s blower. Shut down your furnace off right away and reach our professionals at 224-412-8308 for assistance.

When you’re hearing a strange noise from your furnace, Controlled Comfort HVAC Inc is here to support you. Contact us at 224-412-8308 to book your furnace repair appointment right away.

Back To Blog