August 1, 2019 Uncategorized

Your air conditioner should be able to provide you with comfort while working with minimal operational sound. If it makes too much noise, not only does it make you uncomfortable, it’s also telling you there’s something wrong.

Finding out why an AC is so loud can be quite challenging without actually inspecting the system. It’s difficult to identify where the sounds come from because there could be a number of possible reasons. The best approach is to call a professional who will diagnose the issue and apply appropriate solutions.

Marsh Heating and Air Conditioning is your leading HVAC company in Roseville MN that offers premier AC repair services. Here are the possible reasons for your air conditioner to work with too much noise.


When there’s a continuous hissing sound like gas escaping from your AC, it actually sends a warning, telling you there’s a leak somewhere in the system. Leaks along the copper lines cause your air conditioner to let off refrigerant, which is a serious problem. When the system loses refrigerant charge, not only does it cause the coils to freeze, it can also damage the compressor that may lead to hefty repair costs.

Another cause of a hissing sound could be an internal valve leak, especially the compressor valve. This valve controls the pressurization of the refrigerant and needs to be repaired as soon as possible.

In addition, a hissing air conditioner could be telling you that the compressor itself is faulty because the pressure inside it is too high. The compressor is easily the most expensive part of the AC to repair, which means you’re likely better off replacing the entire unit instead.

Keep in mind that if you’re hearing recurrent hissing sounds that last for a few seconds, it’s likely just the expansion valve. However, if the sound is constant, you need to have a qualified technician find out what’s the problem and fix it.


An air conditioner is designed to function with minimal sound, but if it creates a loud, banging sound, it is telling you the system has some serious damage.

One reason for your unit to make a banging sound is a loose part in the compressor. It could be the crankshaft, a connecting rod, or a piston pin. In most cases, such damages require a compressor replacement. However, there are times when a simple tightening will do the trick.

An unstable blower can also cause your air conditioner to create a banging sound. If it’s unbalanced, it will keep on making that noise as the fan spins. This problem needs professional attention, so be sure to call your local AC professional to get it fixed.


There are a few possible reasons for an AC to make a buzzing noise, one of which is a faulty compressor. As mentioned earlier, the compressor is responsible for pressurizing and cooling the refrigerant in the unit.  A buzzing sound means there’s a problem with the compressor or that the electrical voltage flowing through the outdoor unit is not at its proper amperage.

Your compressor is mounted to the base of the air conditioner and sits on small rubber feet, also known as isolation feet. Since it is used continuously, the rubber on the isolation feet can crack or get damaged, causing the compressor to become unstable. This causes it to create a buzzing noise while running.

If you notice your AC is not able to properly cool your home and has a buzzing sound at the same time, this could mean that the AC has frozen coils. This is a result of refrigerant leaks and can cause a buzzing sound from your system. If this happens, turn off the unit and let the ice melt. After a few hours, it should be able to function again without issue. But if it’s still buzzing, call a professional immediately.

Trust the AC Pros

If your air conditioner is making any of these noises, be sure to call Marsh Heating and Air Conditioning. We have decades of experience in dealing with noisy cooling systems and we know just what to do to get it up and running smoothly again. We are your top New Brighton AC repair contractor serving you since 1974.