Why is my commercial HVAC system noisy? FAQ
6 Different Noises and Their Sources
Different noises coming out of your HVAC system have different underlying issues causing them, so to accurately detect them, you’ll need to know which issues can cause what kinds of noises.
Here’s a list of different types of noises that your HVAC system makes and the issues that cause them to help you navigate through them:
1. Rattling Noises
Disjointment issues like loose components, incorrectly secured access doors etc. can often lead to parts like screws, fan blades, panels, etc. getting loose over time, leading them to “rattle” while operating.
As long as these issues aren’t an indicator of underlying serious problems, they can be easily fixed by simply tightening the parts that came loose, so you could definitely try doing it on your own.
However, it’s better to get it checked by a professional to ensure you aren’t ignoring any indicators of more serious issues that are likely to go unnoticed. Learn more about common HVAC mistakes to avoid.
2. Thumping Sounds
Is your air conditioner making thumping sounds? A broken compressor spring or a fan hitting metal while operating might be the cause.
Broken compressors tend to create thumping sounds while operating, and they need immediate attention from an HVAC professional as they can turn out to be hazardous if left unattended.
Other than these, you should also take a look at your ductwork if you’re noticing thumping sounds, as holes or broken seals in your ductwork can also cause them. Check out our blog on differences between air ducts and air vents to better understand ductwork issues.
3. Squealing or Screeching
Worn-out, broken internal HVAC components can cause squealing or screeching sounds. Maybe your motor bearings are damaged and need to be replaced, or maybe your system’s fan belt has gotten too worn out and needs some extra lubrication.
If you’re noticing squealing or screeching sounds coming out of your HVAC system, talk to an HVAC professional to take a look at your air conditioner’s components, most importantly the motor bearings and fan belts, and repair or replace them as needed.
4. Clanking or Banging
If your HVAC system is making loud clanking or banging noises, it’s a sign of serious internal issues that require immediate attention. Follow these steps:
Shut the System Off Immediately: Turn off your HVAC system to prevent further damage to internal components.
Common Causes
These noises are often caused by:
●A failing compressor
●A damaged piston pin or connecting rod
●Loose or broken internal components
Potential Risks
Ignoring these sounds can lead to costly damage or even safety hazards. There may be deeper underlying problems that only a trained technician can identify.
Call a licensed HVAC professional right away to diagnose and repair the issue before it worsens. For insights on repair vs replacement decisions, see our AC repair vs replacement guide.
5.Clicking
Clicking noises coming from your HVAC system may seem minor, but they can indicate a range of mechanical or electrical problems. Here’s what to look out for:
Likely Causes
●Faulty furnace ignition system
●Loose parts in the compressor or fan unit
●Problematic thermostat
●Other mechanical or electrical issues
Sound Pattern Matters
●Repeated clicking: Often points to a faulty thermostat.
●Intermittent clicking from the furnace: Likely related to ignition system issues.
These problems can escalate quickly, so it’s best to consult a local HVAC professional to accurately diagnose and resolve the issue.
6. Bubbling or Hissing Noise
Bubbling or hissing noises often indicate a refrigerant leak or a clogged condensate drain line within your HVAC system.
Refrigerant leaks can affect other components within the HVAC system, leading to more serious problems. A clogged drain line can cause water to accumulate, creating gurgling and bubbling noises, which can lead to uneven cooling.
So, if you hear bubbling or hissing noises from your HVAC system, it's important to have it inspected by a professional. Learn more about cutting-edge commercial HVAC solutions that can help ensure your system is efficient and safe.
Benefits of Promptly Addressing HVAC System Noise Issues
● Improved Efficiency: Fixing mechanical issues prevents the system from overworking.
● Extended Service Life: Prevents minor issues from escalating into major failures.
● Cost Savings: Timely repairs are more economical than replacing the system.
● Tenant Satisfaction: A quieter environment improves the customer or employee experience.
Potential Drawbacks or Challenges
● Unexpected Costs: Emergency repairs can strain budgets.
● Downtime: Repairs may temporarily interrupt building operations.
● Diagnostic Complexity: Determining the exact source of noise requires specialized knowledge.
Application Scenarios
1、Office Buildings: Grinding noises in rooftop units may disrupt productivity if not resolved quickly.
2、Shopping Malls: Loud clanking from centralized chillers can affect customer experience.
3、Hotels: Hissing or buzzing in guest areas can hurt guest comfort and brand reputation.
4、Hospitals: Any HVAC noise could impact patient well-being and needs urgent attention.
Conclusion
A noisy commercial HVAC system is never something to ignore. While some sounds are part of normal operation, unusual noises often signal mechanical, electrical, or airflow issues. By addressing the root cause promptly, businesses can avoid costly breakdowns, maintain indoor comfort, and extend the system’s life.
Call to Action (CTA)
Is your commercial HVAC system making unusual noises? Don’t wait until a minor issue becomes a costly repair.
👉 Contact Aurashu HVAC today for professional diagnostics and tailored maintenance solutions to keep your system running quietly and efficiently.
