Air Conditioning

5 Most Common Reasons Why Air Conditioning Units Sound Loud

windows with air conditioners, Air Conditioning UnitsIt is uncommon for air conditioning units to sound too loud. Noisy air conditioners can be a nuisance, not to mention an embarrassment, if you have guests over. If your air conditioner makes too much noise, you may wonder what’s causing the issue and how to fix it.

However, there are several potential causes of a loud air conditioner. But it is challenging to identify them, sometimes taking time to discover. As a result, there is often more time for the air conditioning unit. But which reasons result in noisy air conditioning units? Here are some ideas.

1. Faulty Thermostat

One of the most critical components to watch is the thermostat. It is the component that controls the temperature of the Air Conditioning Units, and if it is faulty, the noise can be caused by the unit. The thermostat may be out of calibration, malfunctioning, or have loose wiring.

The thermostat is usually located near the AC unit or in the wall near the vent. If you hear strange noises from your AC unit, the first thing to do is check the thermostat to ensure it’s working correctly. A few calibrations and the air conditioning unit should be back to normal.

2. Dirty Air Filters

Another common cause of the noise is dirty air filters. When the filter becomes clogged with dirt and dust, the air conditioner has to work harder to draw in air, which causes it to make more noise. Cleaning or replacing the air filter once a month can reduce the noise.

Depending on the filter type, homeowners may need to clean it every few weeks or months. If you have a reusable filter, you can easily vacuum off the dirt and dust particles that have built up. However, if their filter is disposable, they must replace it with a new one.

3. Low Refrigerant Levels

Low refrigerant levels can also cause noise in air conditioners. The refrigerant helps the air conditioner cool down the air, but it can cause the unit to make more noise when it’s low. They can be caused by a leak in the system, which must be repaired by an HVAC professional.

Another sign of low refrigerant levels is warm air coming from the vents. If your air conditioner produces lukewarm air, this could be a sign of a refrigerant leak. Leaks in the system can cause the refrigerant levels to drop, resulting in a noisy air conditioner.

4. Frozen Evaporator Coils

If your air conditioner makes a loud noise, it could indicate frozen evaporator coils. The evaporator coils absorb heat from the air, which is released outside. When the rings become too cold, they can freeze up and cause the unit to make a loud noise.

If you suspect your evaporator coils are frozen, turn off your Air Conditioning Units and let them thaw out. Homeowners should also check the air filter and ensure it’s not clogged. They should let the air conditioning unit rest and allow itself to defrost for later use.

5. An Air Conditioning Units with Dirty Condenser Coils

Dirty condenser coils can also cause your air conditioner to make a loud noise. The condenser coils are responsible for releasing heat and moisture from the air. When the rings become clogged with dirt and debris, they can’t do their job efficiently, resulting in a loud noise.


When your air conditioner makes loud noises, it’s usually a sign that something isn’t working correctly. Once you’ve identified the type of noise, you should inspect your air conditioner for any visible signs of damage. Finally, it’s essential to have your air conditioner serviced regularly. An experienced technician can scan your system and ensure it runs efficiently.

AutumnAir is a heating and cooling company providing repair and maintenance services to clients. We provide AC installation in Birmingham, AL, and electrical services as needed. Browse our website and learn more about the services offered today.

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