Why Is My Furnace So Loud? Check These 6 Furnace Parts First…

There are many different parts to your furnace. Because of the many parts there are many different sounds. If you furnace is making unusual noises, it is important to find the source of the sound in order to solve the issue. The noise should not be ignored. Let’s break down the different sounds and see if you can find a solution and a conclusion of which part of the furnace is causing the noise.

It Could Be The Blower Belt

This would be a squealing sound . If your furnace has a belt-driven motor the blower belt can become loose. Over time, your blower belt will need to be adjusted or replaced. While it’s possible to adjust the fan belt on your own, never attempt to replace a damaged blower belt on your own. Another reason for squealing noise can be linked to shaft bearings and other moving parts becoming dry. It is best to have a annual maintenance tuneup so a professional technician can lubricate moving furnace parts . That service call will keep your furnace in peak performance mode all winter long.

Maybe It’s The Blower Motor

This would be loud screeching and rattling sound. The bearings in the blower motor or the blower motor itself could be to blame.The blower motor needs routine lubrication, and often a specific kind of lubrication to upkeep performance and function over time. If you are knowledgeable of the process, you can add lubrication to the motor. This is an in-depth do it yourself project requiring careful motor removal. In most cases, it’s best to contact a professional technician for a proper inspection, oiling, and any other necessary repairs or maintenance. Your blower motor forces the warm air out of your furnace and through the air ducts in your home.

Could Be The Blower Wheel

This would be loud clanking or scraping, classified as a metal-against-metal sound. This signals a serious problem with the furnace’s blower wheel. Most likely the blower fan has become loose and is creating the sound by hitting against the blower house casing. This is something that would require a professional HVAC technical to repair. Do not continue to run your furnace if you are hearing loud metal against metal or scraping sounds. A professional diagnosis is necessary, at best, the wheel is only slightly damaged, and the repair will be minimal, at worst, the blower fan is broken and will need to be professionally replaced.

Maybe It’s The Burners

This would be a loud bang or boom sound. It means you have dirty burners that need to be cleaned, this would happen when you turn the furnace on.. Dirty burners are dangerous because they can delay the ignition. A delayed ignition causes gas to build up and go “boom” or “explode” when the ignition is turned on. The other cause of a loud bang or boom that reverberates throughout the home is an unbalanced air-to-fuel ratio. In order to work properly and efficiently, your furnace needs a proper mixture of air and gas. If you have too much air and not enough gas, gas can build up resulting in a loud booming sound. both of these can be dangerous. If you have dirty burners or a unbalanced air-to-fuel ratio, you will want a professional to inspect the situation and provide the proper cleaning and adjustments.

Maybe It’s The Metal Air Ducts

This is a thud or boom sound . Metal air ducts expand and contract as the temperature changes. This is natural, and does not indicate any damage to the furnace. If this becomes too bothersome, there are some solutions you could discuss with your local professional HVAC company, such as duct sealing, insulation, duct replacement and air filter replacement.

The Heat Exchanger May Be The Problem

This is a rattling sound. This could be just a loose panel or a loose screw. You can attempt to handle this yourself by first turning off power to your furnace at the source. Then, using a screwdriver, you can tighten your panel. This might rectify the rattling. Also, make sure the access panel is fully secured. However, if the rattling is not from a loose screw or access panel, it is much more serious and dangerous. Rattling can be a sign of a faulty heat exchanger. There might be a leak or crack in the heat exchanger. A faulty heat exchanger is usually caused when the furnace has been neglected for a long period of time. A faulty heat excahnger can lead to carbon monocide leaking into your home. If you hear a rattleing sound and a simple tightiening of a screw is not the problem contact a professional technician immediately.

And remember annual furnace maintenance at the beginning of every heating season is the best solution to keep you home warm and safe and efficient . It will keep your furnace in tip top shape for the entire winter. Annual maintenance is cost effective. 

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Phoenix Comfort provides a full range of air conditioning and heating repair, installation, and maintenance services for residential and commercial customers. We keep your air conditioning and heating systems in their best condition and ready to go when you need them most, following the industry’s “best practice” methods and standards. Phoenix Comfort carries a full line of quiet, energy-efficient air conditioning and heating equipment.
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