Hearing strange sounds coming from your HVAC system? You’re not imagining it—those noises can be early warning signs of trouble in your commercial heating or cooling system. At Pro Service Mechanical, we’ve seen it all, and trust us: when your commercial HVAC system makes noise, it’s trying to tell you something.
Ignoring these sounds could lead to system breakdowns, higher repair costs, or worse—complete HVAC failure during peak business hours. Here’s a breakdown of common HVAC noises and what they usually mean.
1. Banging or Clanking
These sounds usually signal loose or broken parts inside the compressor or blower assembly. It could be:
- A loose fan blade hitting another component
- A broken motor mount
- Debris trapped in the system
👉 Left unchecked, these issues can quickly escalate and cause serious internal damage.
2. Squealing or Screeching
If you hear a high-pitched squeal, it might be a worn-out belt or failing motor bearing. These are especially common in older commercial HVAC systems. While not necessarily urgent, these noises indicate parts that need lubrication or replacement before they fail entirely.
3. Buzzing
Buzzing can be hard to pinpoint but often points to electrical issues, such as:
- Loose wiring
- Failing capacitors
- Malfunctioning relays
- Refrigerant leaks or obstructions
Electrical problems should be addressed ASAP to avoid system damage or safety hazards.
4. Rattling
A rattling sound often suggests loose bolts, screws, or debris. Sometimes it’s something as simple as a panel that wasn’t screwed in tightly, but it could also mean components are vibrating due to wear or improper installation.
✔ Pro tip: Regular HVAC maintenance can tighten things up before rattling turns into something more serious.
5. Hissing or Whistling
These sounds may indicate airflow problems, like:
- Leaky ductwork
- Clogged air filters
- A malfunctioning expansion valve
- Refrigerant leaks (especially with hissing)
Restricted airflow makes your system work harder, reducing efficiency and shortening its lifespan.
6. Clicking
A clicking sound when the system starts or stops is normal. But if it becomes repetitive or happens while the system is running, it could signal:
- A failing thermostat
- A defective relay
- Electrical control issues
Don’t let a minor clicking sound lead to a major system failure.
Why Commercial HVAC Noise Shouldn’t Be Ignored
Noisy HVAC systems can:
- Disrupt employees and customers
- Signal upcoming equipment failure
- Cause reduced energy efficiency
- Lead to higher repair or replacement costs
Commercial buildings rely on consistent comfort. If your HVAC system is making odd noises, don’t delay—what sounds like a harmless squeal today could become an expensive repair tomorrow.
When to Call Pro Service Mechanical
Not sure what the noise means? That’s what we’re here for.
At Pro Service Mechanical, we specialize in diagnosing and repairing all types of commercial HVAC systems. Our licensed technicians will:
- Identify the noise source
- Inspect system components
- Perform necessary repairs or part replacements
- Offer proactive maintenance tips to prevent future issues
Keep Your HVAC Quiet, Efficient, and Reliable
Strange sounds from your HVAC system aren’t just annoying—they’re often signs of deeper problems. Don’t risk your business comfort, safety, or bottom line.
Call Pro Service Mechanical today for expert commercial HVAC service in Saskatoon and surrounding areas. We’ll help you silence those noises before they turn into something costly.
