Sounds that Indicate it is Time for a New Furnace

Sounds that Indicate it is Time for a New Furnace

Have you recently noticed that your furnace is making a few more sounds than what you are used to? If so, you may need to take action. While not all sounds are bad, and some are even normal, there are a few indications that let you know something more is going on.

Here you will find a list of sounds that you should be concerned about, what they mean and why it may be time to consider a replacement.

Grinding (Metal on Metal)

If you ever notice a grinding sound coming from your furnace, then you should shut the unit off and call for service right away. In some cases, the grinding sound is a belt problem that may result in more serious issues if it is left running. In other situations, the problem may be with the blower mount or blower wheel. In any case, you need to call a professional technician right away to provide service.

Squealing or Screeching

These types of noises can indicate a serious problem with the furnace’s motor. Additionally, these are not furnace issues that will be able to be handled without a professional technician. In some cases, it may be the bearing in the motor of your furnace, or the belt that connects the unit’s motor to the fan has become frayed or slipped. Other reasons these sounds may be heard include a failing blower motor or that the shaft bearings need maintenance.


If you notice your furnace has begun to vibrate, then it may be because there is something unbalanced in the blower that has resulted in the vibration when the fan is spinning. A professional furnace service tech will be able to investigate and find the cause of these types of issues.


Rattling sounds from a furnace may be something as simple as a panel that has gotten lose, which causes them to rattle as the blower fan is turning; however, it could be more serious. The problem may be with the heat exchanger, which could be a costly repair and may even lead to carbon monoxide leaks if not taken care of quickly.


In most cases, chirping noises that sound metallic are just normal furnace sounds. However, it may also signal other problems with the unit, such as the blower wheel being out of alignment or the mounting plate may be located too close to the unit’s blower wheel.


There are several issues that may cause a humming sound in your furnace. The blower motor, capacitor or some other component may be the culprit. To pinpoint the issue, the best option is to contact the professionals.

If you notice any unusual sounds coming from your furnace, the best thing you can do is call the professionals. They will be able to provide a thorough inspection and let you know if repair is possible or if replacement is needed.

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