If your AC system is making a loud noise, chances are there’s an issue with your AC that you don’t want to ignore.
Your AC system can make a variety of loud noises, but a few of the most common include:
Below, we’ll look at each of these noises and give you an idea of what may be causing them so you know how to move forward.
Have a noisy AC and need a professional's help? No worries, we’ve been working with all kinds of AC issues for years, so no matter what’s going on with your AC, we will be able to diagnose and fix it for you as soon as possible. Learn more about the AC repair services we offer.
If you hear a hissing noise coming from your AC system, the most likely reason is that there’s a leak in your refrigerant line.
Refrigerant is a substance that runs through your entire AC system, from your indoor unit to your outdoor unit and back. Refrigerant absorbs heat from your home’s air and carries that heat to your outdoor unit where it dumps that heat outside. Then it circles back to your indoor unit to carry more heat outside.
But, if there is a leak in your refrigerant line, the escaping refrigerant can make a hissing noise as it leaks out.
If you do have a refrigerant leak you’ll also probably notice:
If these symptoms sound like what’s going on at your house, you should reach out to a professional. A professional will need to repair the leak and then recharge your refrigerant.
A banging noise can be caused by a variety of issues, so we’ll split this up into:
If you hear a banging noise coming from inside your home, it’s probably:
You’re probably dealing with:
If you think you have a loose fan or a loose refrigerant pump, you’ll need to reach out to a professional for help.
A clicking noise is usually an indication that your AC is trying to turn on, but for some reason, cannot.
This is usually the result of:
Regardless of the issue, if you hear a clicking noise, you’ll need to reach out to a professional for help, and we’d suggest sooner rather than later. As we mentioned above, a clicking noise usually means your AC system is trying to turn on but can’t, which means you’ll likely be stuck without cool air until the issue is fixed.
If you hear a buzzing noise, that usually means there’s an electrical issue with your system.
If the buzzing noise is due to an electrical issue, it’s likely coming from:
However, there are a few other reasons your AC could be making a buzzing noise, including:
No matter which of the above issues you have, you’ll need to reach out to a professional for help. All of these repairs/replacements can be difficult to do and you’ll want a trained expert to handle it for you.
If you hear squealing coming from your indoor unit, it’s likely the fan belt that is frayed or misaligned.
The fan belt connects the motor and the fan, but over time, it can wear out which can make a screeching or squealing noise. The belt could have also just become misaligned, in which case it will make a squealing noise as well.
If you’re hearing a pretty regular squealing noise coming from your indoor AC unit, this is likely your issue, and you’ll want to contact a professional to come and realign or replace your fan belt.
More than likely, if you have one of the issues listed above, you’re going to need a professional to come and diagnose and fix the issue. We have quite a few years of experience under our belt, so no matter what is going on with your AC system, we should be able to diagnose the issue and repair it quickly.