Furnaces Noises and What They’re Telling You

December 13, 2023
Furnace repair and maintenance

Furnaces commonly make some noise, such as humming sounds while running. Some noises, however, can indicate that the furnace has a problem and needs to be checked out by an HVAC technician. These are some common noises a furnace may make and what the problem likely is.


A rattling noise can mean several things. The furnace might have a loose part that needs to be tightened back into position. The part might also be worn down and need to be replaced. More rarely, it could mean your furnace is about to fail. In the worst-case scenario, a rattling sound means the heat exchange has cracked, which is a major safety hazard.


If your furnace is making a booming noise when it turns on, the problem is likely a delayed ignition issue. Your thermostat calls for the furnace to turn on, and then the gas valves open and gas enters the ignition chamber. However, when the ignition is delayed, the gas builds up before the burners ignite. This results in all the gas exploding at once when the burners do ignite, leading to a booming noise.

Dogtown Heating, Air & Plumbing in Paxton, IL can help you with this furnace problem. If your situation is urgent, we provide 24/7 emergency service.


A squealing noise can be heard from your furnace because of a few issues. The belt might be faulty or worn, and it will need to be realigned or replaced. Squealing could also mean a motor bearing in the blower is faulty.

Furnace noises can be alarming, but we can help you get to the bottom of them. Dogtown Heating, Air & Plumbing provides heating and cooling repair, installation, and maintenance services. We also help with water heaters, plumbing repair, drains, garbage disposals, indoor air quality assessments and solutions, and boiler services. Get in touch today to find out more or to schedule an appointment.

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