When your furnace is operating properly, it should provide warmth without generating too much noise. While it’s expected to catch your furnace making noise as it turns on, other sounds are showing your furnace should get immediate professional help.

Here are some of the most reported furnace noises and what they could be signaling. If your furnace is making a strange noise, our friendly heating pros are here to fix the problem with the best furnace repair in Saint Louis, Missouri.

1. Furnace Makes a Banging Sound

You might 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 may signal there could be a few problems. These involve gas increasing in your furnace or a ductwork issue.

Banging Sounds Coming from Your Furnace

Your heating system becomes grimy over the years, so that’s why it’s important to schedule yearly furnace maintenance with Morgner Inc. Air Conditioning & Heating. One of the tasks our techs complete during this appointment is clean your furnace’s burners. When this component gets grimy, you could hear your furnace making a loud rumbling noise when ignition takes longer than normal. The subsequent gas buildup may fracture your furnace’s heat exchanger, where natural gas transforms into heat. Any cracks in it can discharge carbon monoxide, which is regularly emitted outside. This hazardous gas can be fatal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Morgner Inc. Air Conditioning & Heating recommends turning it off and reaching us at 314-262-4541. Excessive natural gas in your furnace or a broken heat exchanger are critical troubles that necessitate immediate service.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to provide warm air across your home. If the ductwork wasn’t put in correctly or is aging, it can make a lot of noise when your furnace is on. This may be the issue if your furnace makes a banging noise when it shuts off. Call Morgner Inc. Air Conditioning & Heating at 314-262-4541 and we’ll pinpoint the problem.

2. Furnace Makes a Buzzing Sound

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

Your furnace uses an internal transformer to run on the correct voltage. If wires or the box needs to be tightened, you might notice a low humming noise in the furnace when off. Your furnace also has a blower motor, which sends hot or chilly air throughout your space, and a capacitor, which turns on the motor. If either of these components are going out, 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 due to something small, like an unsecure screw, or something serious, like a broken component. In either case, we urge you to shut your furnace off and getting in touch with our heating professionals at 314-262-4541 for assistance.

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 tell you it needs some TLC. If you’ve forgotten furnace maintenance recently, belts could be worn down or a bearing may need to be greased. We know that maintenance often slips your mind, but our techs can get your furnace heating quietly again quickly.

5. Furnace Makes a Whistling Sound Like Air Escaping

When you’re noticing your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You may also be aware of whistling while the furnace is on if a floor vent is loose. If you’ve checked your vents but are still hearing noise, Morgner Inc. Air Conditioning & Heating can help. It’s essential to get loose ductwork taken care of quickly, as it can create comfort problems in your house and inflate your heating expenses.

6. Furnace Making a Grinding Noise

It’s not a positive sign if you hear your furnace making a grinding noise. This metal-on-metal noise often means there’s trouble with your furnace’s blower. Shut down your furnace off promptly and contact our pros at 314-262-4541 for help.

When you’re noticing an uncommon noise from your furnace, Morgner Inc. Air Conditioning & Heating is ready to provide assistance. Contact us at 314-262-4541 to schedule your furnace repair appointment right away.