When your furnace is working properly, it should give warmth without creating too much disruption. While it’s expected to notice your furnace making noise as it turns on, other sounds are indicating your furnace requires immediate professional assistance.

Here are some of the most common furnace noises and what they might mean. If your furnace is making a strange noise, our friendly heating pros are here to assist with the best furnace repair in Mechanicsburg, Pennsylvania.

1. Furnace Makes Banging or Knocking Sounds

You may have a critical situation 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 a couple of problems. These range from gas increasing in your furnace or a ductwork situation.

Banging Sounds Coming from Your Furnace

Your heating system becomes dirty as time passes, so that’s why it’s critical to set annual furnace maintenance with H & H Service Company. One of the things our techs complete during this work is clean your furnace’s burners. When this component gets grubby, you might hear your furnace making a loud rumbling noise after ignition takes longer than normal. The resulting gas buildup might fracture your furnace’s heat exchanger, where natural gas turns into warmth. Any breaks in it can emit carbon monoxide, which is regularly released outdoors. This toxic gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, H & H Service Company urges you to turn it off and reaching us at 717-220-4502. Too much natural gas in your furnace or a fractured heat exchanger are dangerous troubles that require immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace works with ductwork to move warm air around your house. If the ductwork wasn’t installed correctly or is getting old, it can be noisy when your furnace runs. This could be the issue if your furnace makes a banging noise when it shuts off. Call H & H Service Company at 717-220-4502 and we’ll determine the problem.

2. Furnace Makes a Buzzing Sound

If you hear 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 uses an internal transformer to work on the correct voltage. If wires or the box isn’t tight enough, you may hear a low humming noise in the furnace when off. Your furnace also uses a blower motor, which sends heated or cold air across your home, and a capacitor, which triggers the motor. If either of these pieces are failing, they will buzz when the furnace turns on.

3. Furnace Rattles

If your furnace is making a rattling noise, it can be the result of something little, like an unsecure screw, or something critical, like a broken piece. In either case, we urge you to shut your furnace off and getting in touch with our heating pros at 717-220-4502 for support.

4. Furnace Is Making a High-Pitched Squealing Sound

If your furnace makes a high-pitched noise, like squealing, when it’s running, it’s attempting to alert you it could use some TLC. If you’ve skipped furnace maintenance recently, belts could be worn down or a bearing might need to be greased. We realize that maintenance often slips your mind, but our techs can get your furnace running quietly again quickly.

5. Furnace Whistles

When you’re hearing your furnace making a whistling noise, it’s typically the result of an air leak in your ductwork. You could also notice whistling while the furnace is on if a floor vent isn’t tight. If you’ve looked at your vents but are still sensing noise, H & H Service Company can help. It’s essential to get loose ductwork taken care of quickly, because it can create comfort problems in your house and increase your heating expenses.

6. Furnace Makes Noise that Sounds Like Scraping Metal

It’s not an encouraging sign if you hear your furnace making a grinding noise. This metal-on-metal sound frequently means there’s trouble with your furnace’s blower. Switch off your furnace off instantly and contact us at 717-220-4502 for help.

When you’re hearing a strange noise from your furnace, H & H Service Company is here to support you. Contact us at 717-220-4502 to schedule your furnace repair appointment right away.