Furnace Sounds: Is that Noise Normal?

An adult woman listening to a noise.

The temperatures are still pretty cold out there, which means your furnace is still being put to good use. Every time your heat comes on, you probably hear a light humming sound, which signals that your system is turning on and your furnace is about to run through a cycle. Hearing sounds like humming is quite common, however, there are noises that you can hear coming from your furnace that aren’t as common.

In this blog, you’ll learn which sounds you might hear coming from your furnace that are telling you to schedule an appointment with Carter Comfort Systems as soon as possible.


If you ever hear a squealing noise coming from your furnace, there could be an issue with the system’s blower belt, such as misalignment or general wear and tear. So, if you happen to hear a squealing noise coming from your furnace, just give Carter Comfort Systems a call and we’ll come inspect your system.

Metal Scraping

Metal scraping is a sound that should never be ignored when it comes to your furnace because it usually means something is wrong with the motor mount or blower wheel. If these issues aren’t addressed immediately, your entire system could be damaged, so it’s best to give our team a call at (208) 739-4181 if you ever hear a scraping sound.


Like we mentioned above, a light humming sound when your furnace first turns on is normal, but if you hear a loud banging noise when your system turns on, you might have a problem with the ignition. We recommend having any issues with the ignition checked out immediately by a trained professional.


Whistling noises coming from your furnace usually mean something is blocking the airflow, such as a dirty air filter or an object in the ductwork. If a dirty air filter is the reason behind the whistling, you can simply clean or replace the filter. If you think there might be an object in your ductwork or a different issue that you aren’t comfortable fixing yourself, Carter Comfort Systems can help!

If strange furnace noises have been keeping you up at night, Carter Comfort Systems is here to help. Give us a call at (208) 739-4181 or fill out our online contact form to schedule your furnace repair service. We’ll have you sleeping peacefully in no time!