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Cunningham Associates
Heating and Air Conditioning, Inc.

Six Reasons Why Your Air Conditioning Unit Makes Odd Sounds

Your air conditioning unit is a mechanical device with moving parts and will never run completely silently. However, it is designed to make minimal noise. When it gets really loud or makes odd sounds, something is wrong. Learn the meaning of these sounds so that you can get your air conditioner repaired before it breaks down and leaves you sweating in the hot weather. Here are six common reasons for a noisy air conditioner.

Loose Screws

The moving parts of your AC unit cause vibrations, which in turn may loosen panels and/or mounting screws. When this happens, you will hear rattling sounds. The good news is that it’s easily fixed by tightening the screws with a screwdriver. Beware of opening the AC unit to tighten screws because the thermostat may turn it on while your hands are inside. Leave this type of work to a professional.

Fan Blades Are Rubbing Against Something

Sometimes a stick, branch, or other form of debris rubs against the fan blades. The fan blades may also rub against a warped or damaged fan cage. If you hear very loud rattling sounds, quickly turn the unit off to prevent damage to the fan blades.

Leaking Ductwork

If your ductwork has air leaks from cracks or seams, it may make whistling sounds. Leaks from seams may be easily repaired by tightening the appropriate screws or bolts.

Worn Belt

When a belt wears out, its grip weakens and will slip whenever you turn on your air conditioner. The screeching sound you hear will be momentary. This is similar to the behavior of a loose fan belt in your car that only screeches when you press down on the gas pedal. When you hear this sound, have the belt replaced.

Loud Fan Motor Bearings

This problem usually occurs after many years of use. The lubrication in the fan motor bearings will eventually break down. The bearings then make noise and become damaged from the lack of lubrication. Depending on the AC unit, the bearings might be replaceable. Often the motor isn’t designed for easy bearing replacement, so you may have to replace the entire thing.

Noisy Compressor

Compressors often make noise, but if it’s louder than usual, it may be wearing out. If the noise is accompanied by weak cooling air, your compressor is the likely cause.

Pay attention to the sounds your air conditioner makes because it may be telling you it needs repair or adjustment. Contact Cunningham Associates to resolve the issue before a breakdown occurs.

One thought on “Six Reasons Why Your Air Conditioning Unit Makes Odd Sounds

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