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Why is my HVAC unit so loud?

5 Reasons Why Your HVAC Unit is Loud

Do you find your HVAC unit excessively loud? You are not alone in your confusion. HVAC systems making abnormal sounds can be unsettling, and in this article, we discuss the 5 most common reasons for such loud noises. 

Grinding, buzzing, rattling, squealing, and understanding what is causing the sound can assist you in knowing the correct course of action. Read on to learn why your HVAC unit could be making such loud sounds and what can be done to rectify it.

Your HVAC system is vital in keeping your home cozy throughout the year. Nonetheless, when it starts producing unusual noises, it can be worrisome. 

Let’s dive in and explore the 5 sounds your HVAC system should not be producing and what they could mean. 

1. Banging or Clanking Sounds

hvac loud making banging noise

Banging or clanging noises from your loud AC unit can indicate a problem with one of its mechanical components. 

This could be a loose fan belt, a misaligned or worn fan blade, an unbalanced blower wheel, or an issue with the compressor. Leaving it as is could lead to more significant, more expensive problems.


2. Screeching or Screaming Sounds

hvac loud ac making screaming noise

A loud screeching or screaming noise from your HVAC unit could indicate that the blower motor or belt is failing. 

The noise is usually louder than other sounds, which signifies that you must act quickly before the situation worsens. If you hear this sound coming from your AC unit, you should call a professional immediately to look at it. 

The issue could be something minor that can be easily fixed, but it could also require more extensive work. Having an expert diagnose the problem rather than tackle it alone is best.


3. Whistling Sounds

ac making whistling noise

A whistling sound from your HVAC system can indicate a problem with the air filter. A clogged air filter can cause air to flow through the unit unevenly, resulting in a loud whistling sound.

A whistling noise can also be caused by a leak in your ductwork, which should be inspected and repaired as soon as possible. 

You should also inspect the blower motor of your loud AC unit for signs of wear or debris buildup. If the engine has been damaged, it can produce a loud whistling sound that can be annoying. But, again, replacing the blower motor is the only way to solve this problem.


4. Clicking or Ticking Sounds 

loud ac unit

If you’re hearing a loud clicking noise from your HVAC unit, it could mean an issue with the electrical components. 

This type of sound usually means that the AC unit is trying to turn on, but something is preventing it. It could be an issue with the capacitors, the circuit board, or other electrical components. You’ll need to call an experienced technician to diagnose and fix this issue.


5. Rattling or Vibrating Sounds

ac unit making buzzing noise

If you hear a loud rattling or vibrating sound coming from your AC unit, it could mean that one of the components has come loose. 

If you notice this sound, having a professional inspect your HVAC system immediately is essential. It can be a sign of an issue with one of the components and indicate a more significant problem, such as an unbalanced fan or failing motor. 

If these issues are not addressed quickly, they can lead to more expensive repairs in the future.

Solve Your Loud HVAC Problem with Conditioned Air Solutions 

If your HVAC system is making strange noises, it’s essential to take action to prevent further damage and keep your home comfortable. Understanding these five common HVAC system sounds and how to fix them ensures your HVAC system runs smoothly and quietly. 

Call Conditioned Air Solutions for AC Repair in Huntsville, AL. Let our team of expert techs inspect, diagnose and repair your loud HVAC unit issues.