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Why Is My AC So Loud?

February 19, 2023

Having a working air conditioning system is essential to staying comfortable in your home on a hot day. However, over time, your system can begin to make odd noises that you may not recognize. It’s important to know what these sounds mean so you can get them fixed as soon as possible.

Start Up Noises

When your AC starts up, you should hear a whirring or whooshing sound. This is a normal noise and does not mean that there is a problem.

This sound can be caused by a variety of issues, such as the fan motor or the blades being loose. It’s best to let an HVAC professional take a look at the problem.

A rattling noise is caused by outside debris that gets stuck inside of your AC system. You can try to remove any branches, leaves or other objects from the area around your system.

If a rattling sound doesn’t go away after a few minutes, you should call a repair technician. It could be a part that’s been worn down or damaged, so it may need to be replaced.

Grinding or Screeching Noises

Another common reason for an ac making a loud, grinding or screeching noise is due to the blower motor’s bearings. Every AC unit has these bearings that help the motor spin, but these can become damaged or worn down over time.

In this case, it’s best to have a professional take a look at the situation and replace the blower motor. The new motor will be much quieter than the old one.

The rattling noise can also be caused by a clogged filter. It’s recommended to have your filtration system cleaned and checked at least once a year by an expert.

You should also check the copper lines that connect your ducts to your air conditioning system. These can sometimes rub together and cause a buzzing sound.

Your ac compressor running loud

The AC compressor is one of the most important parts of your air conditioning system. It helps to move refrigerant throughout your ductwork so that it can create cold air. If the compressor isn’t functioning correctly, it will be hard for your air conditioner to cool your house.

A broken contactor relay switch can also cause your ac to run loudly. This is a part that controls the high voltage to the compressor from your thermostat.

Often times, the noise can be fixed by tightening some screws or changing out the contactor relay switch. This is a fairly simple job that you can do yourself.

If this doesn’t fix the problem, you should have a professional inspect your ac and replace the contactsor relay switch.

Your AC is a complex machine, and it can be difficult to identify the source of the problem. If you suspect the issue, it’s best to have an HVAC professional take a look at it.

Blower motors are notorious for causing a lot of noise, especially as they age. Many AC systems still use these older motors, but newer ones are designed to be much more quiet.



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