15 Reasons Why Your Cary HVAC Unit So Loud

One of our customers recently called us with a pretty common question, “Why is my HVAC unit SO loud?” Considering how often we are asked this question, we thought we'd explore the many reasons that your Cary HVAC unit may be loud during operation, and how you can resolve the issue.

What is Causing Your Cary HVAC Unit to be SO LOUD?

Anytime your HVAC unit is not functioning as it should, is a cause for concern; however, some level of noise is no reason to be alarmed. Most HVAC units produce a quiet, continuous hum when it is running. It's both normal and to be expected if it is properly functioning.

That said, a loud HVAC is not normal. In fact, if you hear any of the noises below, you should have your Cary HVAC system checked out.

Indoor Unit 

Squealing, Rattling, Screeching or Banging Types of Noises

  • If you hear any of these types of noises coming from an indoor unit is usually a sign that the belt is worn or misaligned or even a bad bearing in one of the motors. The squealing sound can vary as different temperatures and humidity levels cause the belt to expand and contract. The good news is that it's an inexpensive fix (in the whole scheme of things), but you should give us a call to have the part replaced.
  • Another common reason that you may hear a screeching noise is that the pads that absorb the motion noise produced by the internal parts of your HVAC unit could be worn. Over time, they wear down and can begin to crumble or break, which will obviously increase the amount of noise you hear from your air conditioner.
  • OR, the refrigerant lines could be installed too tightly, especially if you just moved into a new home. It's an easy fix so just have one of our technicians come out to adjust the air conditioner.
  • It's always possible that a part has come loose. Unless you're an experienced mechanic, you'll want to give us a call to repair the issue as soon as possible. Ignoring the problem could cause further issues.
  • Finally, your indoor unit's blower motor could be old or has malfunctioned. This will require a replacement.

Clicking Noises

  • If you hear a constant clicking inside your home, this is typically a sign that your thermostat has a problem relaying information between the thermostat and your HVAC system. Try resetting the system and see if that solves the problem.

Outdoor Units 

Ratting or Thwarping Sounds

  • If you hear a loud or sudden rattle from your HVAC unit, you may want to check outside to see if a branch or twig has fallen and gotten caught up in your exhaust fan. Often, during a storm, these sorts of situations occur and they're usually pretty obvious once you do a visual inspection. If you do need to take a closer look, be sure to turn the power off to the exterior unit. And if you notice any damage to moving parts or you see bent metal, be sure to give us a call.
  • It's also possible that your Cary HVAC's motor may be failing. If you suspect this may be the case, give us a call immediately.
  • The outdoor unit’s compressor has gone bad due to age or malfunction.

Buzzing Sounds

  • If you hear buzzing, this is a tell-tell sign that your HVAC is on its last leg. Generally speaking, HVAC units typically last between 10-15 years, so if your A/C is buzzing, it's time to start looking for a replacement appliance.
  • If you have a gas or oil-fired HVAC system, and you hear an unusual rumbling sound associated with combustion, give us a call ASAP!

Vents, Registers and Ductwork

Hissing Sounds

  • We don't know about you, but when we hear hissing, we look for a snake. As such, if you hear hissing coming from your vents and registers, you should be concerned as it may signal improperly sealed ductwork or even a coolant leak.
  • Hissing sounds could also be coming from your heat pump, so if you hear hissing, you may need to shut down the heat pump and check that there isn't a leaky refrigerant valve. If there is, schedule an appointment with our Cary HVAC team to repair the issue.

High-Pitched Vibrating

  • If you hear this particular (and incredibly annoying) sound, it typically means that there is a lack of return air because too many vents are either closed or blocked. This is usually an easy fix - check your vents to make sure they are open and see if that resolves the problem. If not, it could also be due to improperly installed ductwork.
  • Vibrations could also mean that the motor is off-balance.

If you hear any of the above noises, allow the professionals at CHOICE Heating & Air Conditioning to diagnose the problem.  Call Choice HVAC at 919-435-2711 to schedule your maintenance visit before you have a more serious problem.

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