HELP! There Are Noises Coming From My Air Conditioning Unit

Odd noises are some of the best indicators that something is wrong with your AC unit. Weird sounds in your air conditioning unit may indicate problems, but in order to diagnose the specific problem, you’ll need to know exactly which of these sounds your unit has been making.


One of the more common noises in AC units, rattling is either barely noticeable or extremely annoying. Rattling usually indicates small problems—loose nuts, bolts, screws or other small parts within your unit. Additionally, it can indicate that a piece of your unit has broken off and is vibrating on the bottom of your unit, as it functions. Ratting can also be caused by parts of your unit being too close to the walls of your air conditioner.


A banging noise can entail a part is loose within your unit. The fan could be loose or damaged, causing it to hit parts of your unit, while trying to function. Banging can also result in loose or broken parts within your compressor, or an incorrect mounting of your compressor. If you see any shaking or broken pieces within your unit while it’s on, that’s likely the culprit. If not, the problem may require professional assistance.


Buzzing is almost always a sign of electrical issues within your unit. If buzzing only occurs when triggering certain settings through your control panel, it’s likely just a faulty part. But, if the buzzing is constant, it’s more likely to indicate a problem with the wiring, like a loose or exposed wire, causing electricity to spark within the unit.


Clicking is a vague sound to hear in an AC unit. Like rattling, it could imply that a part is loose and is barely hitting another part within your unit. Also, it could indicate that your fan is brushing up against something as it’s spinning. Clicking sounds typically draw attention to electrical issues within your control panel. Faulty electrical signals create clicking noises with tiny sparks of electricity and by continuously causing switches to turn on and off.

Loud Whistling or Screeching

If you hear this noise, it’s best to turn the unit off as soon as possible. Screeching can be indicative of pressure building up and trying to escape within your compressor. While there are safety precautions installed to turn off the unit when this is detected, it’s still possible for this issue to occur. If you hear this noise, contact a repair technician immediately.