AC Noises You Should and Shouldn’t Worry About

Air conditioners work hard to regulate building temperatures (especially in Florida), and they make many types of noises in the process. There are some sounds that should cause concern, but there are just as many that are just signs that the AC unit is working. So which noises are fine and which ones are not when it comes to your AC?

Normal Noises 

Whooshing on Startup

Starting up an air conditioner involves several moving parts going at the same time. This can cause a noise that sounds like a miniature plane lifting off. The noise should go away a few seconds after the unit starts up, and you may hear it again at the start of the next cooling cycle.

Light Blowing

In a quiet home or office space, you may occasionally notice the sound of the air conditioner blowing. As long as the noise is quiet enough to fade into the background, there’s no reason to worry.

Occasional Clicking

When your system completes a cooling cycle, you may hear clicking noises as the machinery comes to a stop. This should go away after a few seconds. If the clicking is constant, it can be a sign of a failing thermostat or a defective control.


Concerning Noises


Banging sounds likely mean something is broken or loose. If you hear these types of noises, turn your system off immediately, and call a professional repair company. You don’t want whatever’s loose in your system to cause further damage.


There are a couple ways screeching can present itself in AC units. Constant screeching is caused by fan motor issues. If you only hear screeching when the unit starts up, the issue is the compressor. Either way, screeching means it’s time to replace a part.


Buzzing noises indicate that the system has an electrical issue. Many electrical components make an air conditioner work, and all are harmful to work with if you don’t know what you’re doing. Call a professional if you hear your AC buzzing. 

HVAC units make all kinds of noises, and even with this guide, you may want the help of a professional to diagnose the issue. Our All Temp team provides AC repair services in Kissimmee, as well as inspections and maintenance. Contact us online or give us a call at (407) 857-7800 to schedule an appointment.

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