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Proudly Serving The Columbia Area Since 1985

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Proudly Serving The Columbia Area Since 1985


Fulmer Heating & Cooling Blog

5 Sounds Your AC Is Not Meant to Make


If you turn on your car or your computer and notice that the machine is making a concerning sound, odds are that you’ll start to investigate what is causing that noise. In almost every case, we understand that new noises from our machine are an indicator of trouble. Your AC system is no exception to the rule!

A cooling system that has begun to make new and worrisome noises is one that likely need air conditioning repair in Columbia, SC. If you aren’t sure which noises are good or bad to hear from your AC, we can help. Read on to learn about 5 noises you don’t want to hear from your air conditioner so you know when to reach out to us for repairs.

1. Rattling

When your AC is running, does it sound like there is something being shaken up in the system? We will ask you to do a little bit of leg work to help narrow down the source of this sound.

In one case, you may just have a loose blower door. If tightening the door resolves the sound, then you re probably good to go.

However, if that isn’t the source of the sound, you may have a loose part deeper in your system. Bolts, screwss and even fan blades can get loose over the years so make sure to have this noise investiaged to catch and tighten that loose part before it escalates.

2. Clanging

If you had a rattling noise coming from your AC that wasn’t attended to, that sound may transform into a clanging. What this means is that the loose part has broken free and is now bouncing around inside of your system. This can lead to more serious damage to other components in your system so it is best to get a technician to your home ASAP before things worsen.

3. Hissing

We want to alert your to this noise because it is so commonly missed. Hissing isn’t normal. Don’t mistake it for the regular sound of air being pushed through your system. If you hear hissing from your AC is may indicate 1) your have a leak in your ductwork or 2) you have a leak in your refrigerant line. In either case, you’ll want to have your system checked out.

4. Screeching

This is a highly unpleasant noise to hear from your AC. At the least we hope this encourages a quick response to have the screeching noise addressed.

Screeching, also described as squealing or screaming, is created by metal scraping or dragging against metal. In an air conditioner, this may mean you have a loose fan blade that is scraping its metal housing. It may also mean you have a dry blower motor belt or dry motor bearings in need of lubrication.

5. Humming or Buzzing

You should also be on the alert for anytime your AC starts to hum or buzz. These noises, while they may seem minor, can indicate electrical troubles in your system. Have a technician check your system before your AC causes a circuit to trip.

Is your AC creating a ruckus or just leaving you overheated? If so, contact Fulmer Heating & Cooling for your next repair. Proudly serving homes throughout Columbia for over 30years.

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