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Grinding, Squealing and Screeching: Interpreting the Noises Your HVAC Makes

If something is failing or going amiss with your HVAC unit, chances are, your HVAC unit is letting you know something is not quite right. However, most of the cues come in the form of sounds that many of us may overlook. If you hear your HVAC unit grinding, squealing, screeching or squeaking, it is letting you know it needs help. I was unaware of these cues and overlooked them. It ended up costing me a lot of money in repairs. I want to make sure that does not happen to other people, so I made this website. I hope you learn how to interpret the noises your HVAC unit is making so you can get it the repairs it needs before you incur a costly repair, or worse, permanently ruin your unit for good.

Grinding, Squealing and Screeching: Interpreting the Noises Your HVAC Makes

What’s That Banging Sound from Your Heating System?

by Billie Carlson

There’s nothing like settling in for a cozy evening at home, only to be interrupted by a sudden loud banging coming from your heating system. It’s an unsettling sound that can leave homeowners wondering if they need to call a professional. If you hear strange noises coming from your furnace, don't panic! Here's what could be causing it and what you can do about it.

Delayed Ignition - A common cause of banging sounds coming from a furnace is a problem with the ignition. If the burners in your furnace fail to ignite promptly, gas may accumulate in the furnace until the burners eventually ignite, potentially leading to a minor explosion, also known as a mini blast. This noise is usually a low booming or banging sound that can be emitted just once or multiple times before the system shuts down. It is advisable to seek the assistance of a professional to diagnose and resolve the issue rather than attempting to fix it on your own.

Loose Ductwork - Another possible reason for the banging or rumbling sound could be loose ductwork. The HVAC system's components, including the furnace, ductwork, and vents, are all connected. If the ductwork is not properly secured, it can vibrate when the furnace is turned on, producing banging or rattling noises. Check the ductwork for possible leaks, patches, or areas with excess dust. If you notice any issues, call a professional who can secure the ducts and adjust the airflow.

Dirty Burners - If your furnace's burners are dirty, a loud rumbling sound may come from the furnace as it runs. The burner's dirty condition makes it difficult for the natural gas to combust inside of it, which causes the gas to build up and emit a loud bang when it ignites. Schedule a professional to come out and clean the burners and other essential furnace components to ensure the system runs efficiently and without any further issues.

Blocked Vents - Banging sounds can also result from clogged vents. If the furnace can't circulate hot air efficiently, the heat could build up in the system’s blower instead, causing a loud banging noise as the heated air tries to escape through a blocked air vent. Observe every vent in your home, removing any items that may obstruct airflow. If the issue persists, contact a professional.

Aging Components - Your furnace's age also has a significant impact on its overall performance. As your system ages, wear and tear gradually degrade essential components such as fans, thermocouples, and other furnace parts. A noise complaint from an aging furnace may be a sign that there is significant damage inside, requiring an entire system overhaul or furnace replacement.

There's no need to become overly worried when your heating system starts making loud noises, but it is best to call a professional to diagnose the issue. Regular professional maintenance can prevent future breakdowns and help extend the lifespan of your heating system. Remember, when your furnace makes odd sounds, it's essential to take advice from an expert who can help your system run efficiently and avoid potential safety hazards.

To learn more information about your heating system, reach out to heating contractors near you.