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Bill's Superheat, Inc. Blog

What Is Wrong With A Noisy Furnace?

It’s that time of year again! Yeah, we said it! Time to take a good look at that screeching, dust-infested Ol’ Faithful hidden in the back of your basement and see what that baby’s worth. Now I know what you might be thinking. The last repair person was here just a little over a year ago, there’s no need to look into those kinds of expenses. But think again. If your furnace is doing anything more than the regular, low-pitched monotone humming while the blower runs, then there’s a high chance that you’re in need of professional furnace repair.

In order to ensure that peace of mind while you spend this festive season in the comfort and warmth of your full house, here’s a quick list of furnace noises that should let you know when your home is at risk. Additionally, we’ll let you in on where you can find the best professional furnace repair in Kalispell, MT.

Rattling and Rumbling

When your furnace is making an unusual rattling and/or rumbling noise, it is probably due to a loose component. This most commonly occurs in the blower motor, hot surface ignitor, heat exchanger, or gas burners. This situation increases the risk of carbon monoxide poisoning. If the rattling and rumbling persists after a couple of tries, it’s time to contact a professional HVAC technician immediately.

Screeching and Squealing

High-pitched squealing noises are an indicator of a problem with the furnace’s blowing motor. This could mean a damaged or loose belt, but the issue could be more complex. In any case, contacting a certified HVAC professional is highly recommended.


Thumping and bumping noises like from a broken washing machine spinner, may be caused by a small gas explosion that happens due to a delay in ignition. Gas often gets built up in a combustion chamber when the burners in your furnace do not ignite on time. Do not attempt to fix a gas burner without a licensed professional. Taking apart the heat exchanger or burners can lead to a gas leak in your home.


If your furnace is making a scraping or scratching noise, this can be due to a problem with the bearings within the surface blower. This could also mean that the blower wheel may have come loose. In case the problem is with the bearings, you should note that regular lubrication is necessary for them to maintain proper function. In either case, contacting a professional HVAC technician for immediate repair is advised.

Popping and Banging

If you notice a loud popping noise when your furnace is activated, the cause of this problem is inflation in your air ducts. This could be due to the warm air that collides with the cold air ducts, which causes the metal to enlarge, producing a popping noise. Another cause of the noise may be contaminated gas burners in your furnace. Sediment will start to collect on the burners over long periods of time. If not cleaned out with annual maintenance, this causes gas accumulation and the potential to cause breaks and holes in your heat exchanger. A certified professional should be contacted immediately.

We want you to have a safe and comfort-filled festive season. If you are noticing any of the above-mentioned furnace noises, contact and schedule furnace repair in Kalispell, MT. Whether it’s heating repair, annual maintenance, or even heating installation, they’ve got you covered.

No matter the situation, Bill’s Superheat Inc. is Here to Save the Day!

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