What Is That Noise My Furnace Is Making?

Wondering about that strange noise coming from your furnace?

It’s completely normal to hear sounds coming out of the furnace in your home every now and then. It is, after all, a mechanism made up of various moving parts. Some noises like a steady humming or the occasional pop from its ducts can be expected.

It is important to keep in mind that the noises your furnace make should never be loud or persistent enough to keep you awake throughout the night. If you notice that the furnace is running louder than normal it is time to get in touch with your trusted HVAC company. Upon inspection, your technician mar determine your furnace needs HVAC repair or simply a good cleaning with a furnace tune-up.  

Meanwhile, let’s explore the types of noises you might be hearing from your furnace and what they could mean. You will need to listen for these three specific types of sounds coming from your furnace since they indicate specific issues.

The furnace “squeals” or “whines”

This is a relatively minor issue, but addressing this right away to prevent it from progressing into more serious problem is key. When a high-pitched noise emanates from your furnace, the problem could be:

  • The blower belt has come loose, begun to fray, or is slipping
  • Lubrication must be applied to the shaft bearings
  • The blower motor is not working properly and must be replaced or fixed

There’s a loud pop or bang whenever the furnace is turned on

This sound can come from two possible causes:

  • The air ducts are contracting and expanding. Most homes with metal ducts installed will frequently hear this kind of noise. Every time the furnace turns on or turns off, these ducts expand and contract — perhaps due to a clogged air filter, closed vents, or flimsy or undersized ducts.
  • The furnace burners are dirty. Gas builds up whenever the ignition of the burners is delayed; this delay can be caused by the dirt found on the furnace. The pop you hear is from the gas finally igniting. Once you do hear this sound, it’s best to call HVAC specialists right away; those minor explosions could eventually crack the heat exchanger — repairing that particular part can be expensive.

There is a sound of metal scraping against metal

This sound can be quite annoying since it is similar to nails scratching on a chalkboard. If you hear this sound, it means that there is a problem with the blower wheel in your furnace.

The following blower wheel problems could be causing the scraping sound:

  • The blower wheel has gotten loose from the motor shaft; as a result, it now hits the blower casing. This can be resolved by simply tightening the wheel.
  • The blower wheel is broken beyond repair and must be replaced.
  • The motor mount is broken, which means the entire blower has dropped and hit the housing.

To ensure that minor issues are resolved without becoming major ones, call your Hometown heating and air conditioning company as soon as you hear any of these noises. 


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