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

When your furnace is working properly, it should provide heat without generating too much noise. While it’s expected to notice your furnace making noise as it begins running, other disruptions are indicating your furnace should get immediate professional assistance.

Here are some of the most frequent furnace noises and what they might be signaling. If your furnace is making an odd noise, our friendly heating professionals are here to assist with the best furnace repair in Shreveport.

1. Furnace Making a Banging Noise

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

Banging Sounds Coming from Your Furnace

Your heating system turns filthy over time, so that’s why it’s important to book annual furnace maintenance with Moon's Air. One of the tasks our techs complete during this service is clean your furnace’s burners. When this part gets dirty, you might hear your furnace making a loud rumbling noise after ignition takes more time. The subsequent gas buildup may fracture your furnace’s heat exchanger, where natural gas turns into warmth. Any breaks in it can leak carbon monoxide, which is normally vented away from your home. This hazardous gas can be lethal in large concentrations.

If you’re hearing banging or knocking sounds coming from your furnace, Moon's Air advises turning it off and reaching us at 318-215-7938. Excessive natural gas in your furnace or a ruptured heat exchanger are hazardous issues that should get fast attention.

Banging Sounds Coming from Your Ductwork

Your furnace relies on ductwork to deliver hot air around your house. If the ductwork wasn’t designed right or is getting old, it can be loud when your furnace is on. This may be the problem if your furnace makes a banging noise when it shuts off. Contact Moon's Air at 318-215-7938 and we’ll determine 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 typically is telling you there’s an electrical problem, like with its transformer, blower motor or capacitor.

Your furnace relies on an internal transformer to run on the correct voltage. If wires or the box is loose, you might notice a low humming noise in the furnace when off. Your furnace also works with a blower motor, which sends heated or chilly air across your house, and a capacitor, which triggers the motor. If either of these parts are failing, they will buzz when the furnace starts.

3. Furnace Making a Rattling Noise

If your furnace is making a rattling noise, it may be related to something minor, like an unfastened screw, or something critical, like a broken component. In either case, we advise shutting your furnace off and calling our heating specialists at 318-215-7938 for support.

4. Furnace Making a Squealing Noise

If your furnace makes a high-pitched noise, like squealing, when it’s going, it’s attempting to get your attention it needs some TLC. If you’ve skipped furnace maintenance the last couple of years, belts could be worn down or a bearing might need to be lubed. We realize that maintenance sometimes slips your mind, but our pros can get your furnace operating quietly again fast.

5. Furnace Making a Whistling Noise

When you’re detecting your furnace making a whistling noise, it’s likely because of an air leak in your ductwork. You could 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 noticing sound, Moon's Air can provide support. It’s critical to get loose ductwork repaired quickly, since it can make comfort troubles in your residence and drive up your heating expenses.

6. Furnace Making a Grinding Noise

It’s not an encouraging sign if you hear your furnace making a grinding noise. This metal-on-metal racket usually means there’s an issue with your furnace’s blower. Switch off your furnace off right away and reach us at 318-215-7938 for help.

When you’re hearing an uncommon noise from your furnace, Moon's Air is ready to provide assistance. Contact us at 318-215-7938 to book your furnace repair appointment right away.

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