When your furnace is operating correctly, it should deliver heat without generating too much noise. While it’s normal to catch your furnace making noise as it starts up, other sounds are signaling your furnace requires immediate professional support.

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

1. Furnace Makes Banging or Knocking Sounds

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

Banging Sounds Coming from Your Furnace

Your heating system becomes filthy as time passes, so that’s why it’s essential to book annual furnace maintenance with Gilray Heating and Cooling. One of the tasks our pros perform during this appointment is clean your furnace’s burners. When this part gets dirty, you may hear your furnace making a loud rumbling noise if ignition takes more time. The subsequent gas buildup might fracture your furnace’s heat exchanger, where natural gas turns into heat. Any breaks in it can emit carbon monoxide, which is normally emitted outside. This dangerous gas can be deadly in large concentrations.

If you’re noticing banging or knocking sounds coming from your furnace, Gilray Heating and Cooling urges you to turn it off and reaching us at 715-301-0727. Significant natural gas in your furnace or a fractured heat exchanger are critical issues that necessitate immediate attention.

Banging Sounds Coming from Your Ductwork

Your furnace uses ductwork to deliver hot air throughout your home. If the ductwork wasn’t designed properly or is getting old, it can be loud when your furnace runs. This could be the problem if your furnace makes a banging noise when it shuts off. Call Gilray Heating and Cooling at 715-301-0727 and we’ll figure out the problem.

2. Furnace Making a Buzzing Noise

If you observe your furnace making a buzzing noise, don’t delay calling us. A buzzing sound often indicates an electrical situation, like with its transformer, blower motor or capacitor.

Your furnace uses an internal transformer to work on the right voltage. If wires or the box isn’t tight enough, you might hear a low humming noise in the furnace when off. Your furnace also works with a blower motor, which distributes heated or cold air across your house, and a capacitor, which starts the motor. If either of these pieces are fading, they will buzz when the furnace switches on.

3. Furnace Makes Rattling Sounds Like Something Is Loose

If your furnace is making a rattling noise, it could be due to something minor, like an unsecure screw, or something major, like a broken piece. In either case, we recommend shutting off your furnace and contacting our heating pros at 715-301-0727 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 get your attention it needs some TLC. If you’ve neglected furnace maintenance the past few years, belts could be worn down or a bearing may need to be greased. We realize that maintenance sometimes slips your mind, but our pros can get your furnace running quietly again fast.

5. Furnace Whistles

When you’re detecting your furnace making a whistling noise, it’s typically because of an air leak in your ductwork. You could also be aware of whistling while the furnace is operating if a floor vent is loose. If you’ve examined your vents but are still noticing whistling, Gilray Heating and Cooling can help. It’s critical to get loose ductwork repaired quickly, because it can create comfort problems in your house and increase your energy bills.

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 noise typically means there’s trouble with your furnace’s blower. Switch off your furnace off now and contact our pros at 715-301-0727 for assistance.

When you’re noticing an uncommon noise from your furnace, Gilray Heating and Cooling is ready to provide assistance. Contact us at 715-301-0727 to book your furnace repair appointment right away.