4 Problematic Air Conditioning Noises To Listen For

An air conditioner doesn't make much noise, when it is running. The condenser runs outside, but it is a consistent hum that will almost sound like white noise inside your home. There are noises that are a clear indication that your air conditioner will need to be serviced in the near future. Here are 4 problematic noises to look out for.


Is there a constant thumping noise that seems to be coming from inside your air handler, when the air conditioner is running? If so, this could be the blower fan making contact with debris inside the air handler.

Open up the air handler to get a closer look at those fan blades. Verify that all of them area clean and straight. If one is bent, this could cause the air conditioner to operate with a loud noise. If you see an obstruction that is bumping into the fan blades, get rid of it.


A squealing sound means two potential problems. Start by checking the belt on the blower fan, since it could be worn down or loose. This belt needs occasional adjustment for it to remain taut when running through the pulleys, and eventually, it will need to be replaced, when it gets old.

When you do not have a blower fan driven by a belt, the problem could be with a blower that needs more lubrication. Without lubrication, the heat that this part generates from friction will eventually cause the motor to fail.


An air conditioner will make a clicking noise when it turns off and on, but you should never hear rapid clicking. A constant clicking sound can tell you that the system is short cycling, which will reduce the lifespan of the air conditioner, if the problem is not addressed.

Clicking can be caused by a variety of problems, such as low refrigerant or having an air conditioner that is too large for your home's square footage. A faulty relay switch can also be responsible for the noise.


Do you hear a hissing sound coming from the air conditioner? This is a sign that refrigerant is leaking out of the system somewhere near you. This problem requires having an HVAC repair service find the leak with the assistance of ultraviolet dye, fix it, and then recharge the system with refrigerant.

Experiencing a sound not listed here? Contact a professional HVAC service technician for assistance with getting the problem fixed.

For more information, talk to companies like Allied Mechanical & Electrical, Inc.