When your furnace is working properly, it should give warm air without making too much noise. While it’s expected to notice your furnace making noise as it turns on, other noises are showing your furnace should get immediate professional help.

Here are some of the most frequent furnace noises and what they can be signaling. If your furnace is making a weird noise, our friendly heating professionals are here to help with the best furnace repair in Mount Horeb, Wisconsin.

1. Furnace Makes Banging or Knocking Sounds

You might have a critical situation on your hands if you’re detecting your furnace making a banging noise. If your furnace is making a knocking noise, it may signal there could be a few problems. These range from gas building up in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system gets dirty over the years, so that’s why it’s critical to schedule annual furnace maintenance with JW Brager Heating and Cooling. One of the tasks our pros do during this service 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 ensuing gas buildup might crack your furnace’s heat exchanger, where natural gas changes into warm air. Any cracks in it can emit carbon monoxide, which is regularly released outside. This toxic gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, JW Brager Heating and Cooling urges you to turn it off and contacting us at 608-447-0555. Too much natural gas in your furnace or a ruptured heat exchanger are serious issues that should get immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move hot air around your home. If the ductwork wasn’t installed correctly or is aging, it can be noisy when your furnace is on. This can be the issue if your furnace makes a banging noise when it shuts off. Call JW Brager Heating and Cooling at 608-447-0555 and we’ll figure out the problem.

2. Furnace Makes a Buzzing Sound

If you observe your furnace making a buzzing noise, don’t hesitate to call us. A buzzing sound often means there’s an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace depends on an internal transformer to run on the right voltage. If wires or the box isn’t tight enough, you could detect a low humming noise in the furnace when off. Your furnace also works with a blower motor, which moves heated or chilly air throughout your house, and a capacitor, which starts the motor. If either of these parts are going out, 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 minor, like an unfastened screw, or something major, like a broken piece. In either case, we urge you to shut your furnace off and calling our heating pros at 608-447-0555 for assistance.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to alert you it requires some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn out or a bearing may need to be greased. We know that maintenance frequently slips your mind, but our pros can get your furnace heating quietly again rapidly.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re detecting your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You could also notice whistling while the furnace is working if a floor vent isn’t secure. If you’ve checked your vents but are still sensing noise, JW Brager Heating and Cooling can assist you. It’s important to get loose ductwork fixed fast, because it can result in comfort troubles in your house and inflate your gas costs.

6. Furnace Makes a Loud, Unpleasant Grinding Noise

It’s not a good sign if you detect your furnace making a grinding noise. This metal-on-metal sound often means there’s trouble with your furnace’s blower. Switch off your furnace off instantly and reach our professionals at 608-447-0555 for help.

When you’re hearing a weird noise from your furnace, JW Brager Heating and Cooling is available to help. Contact us at 608-447-0555 to book your furnace repair appointment now.