7 Signs You Need Commercial HVAC Maintenance Immediately

Your HVAC system is the unsung hero of your commercial building. It keeps you warm in the winter, cool in the summer, and maintains air quality all year long. But like any mechanical system, it doesn’t last forever—and when problems arise, they often come with early warning signs. Ignoring them can lead to bigger breakdowns, reduced comfort, and skyrocketing energy bills.

If you're a facility manager, knowing the signs of HVAC trouble can help you act before small issues become expensive emergencies. Here are the top 7 signs you need commercial HVAC maintenance.

1. Unusual or Loud Noises

HVAC systems aren't silent, but they shouldn’t be noisy, either. If you hear clanking, grinding, screeching, banging, or rattling sounds, that’s a red flag.

• Grinding or squealing may indicate worn-out belts or bearings.

• Banging can point to loose or broken parts inside the compressor or blower.

• Hissing may suggest a refrigerant leak or ductwork issue.

These noises are often the first clue that components are under stress or failing. Ignoring them could lead to a complete system shutdown.

2. Weak or Inconsistent Airflow

If your vents are blowing weak air or some rooms are getting more airflow than others, your system is not distributing air properly. This could be caused by:

• A clogged air filter

• Damaged ductwork

• A failing blower motor

• Closed or obstructed vents

Poor airflow affects comfort and forces your HVAC system to work harder, which increases wear and shortens its lifespan. Addressing the issue early helps restore performance and energy efficiency.

3. Unexplained Increase in Energy Bills

A sudden spike in your energy bill without a corresponding change in usage is a strong indicator that something is wrong with your HVAC system.

When systems are struggling—due to dirty coils, low refrigerant, or faulty thermostats—they consume more energy to maintain the same comfort level. Routine maintenance can prevent this, but if your bill jumps unexpectedly, it’s time for a professional inspection.

4. Inconsistent Temperatures Throughout the Building

If some rooms are freezing while others feel like a sauna, your HVAC system may be:

• Short cycling (turning on and off too frequently)

• Poorly sized for your building

• Experiencing thermostat malfunctions

• Suffering from unbalanced ductwork

Temperature imbalances are not only uncomfortable but can also signal underlying system inefficiencies or breakdowns. An HVAC technician can diagnose whether it’s a zoning issue, a sensor failure, or something more serious.

5. Foul or Musty Odors

Unpleasant smells coming from your vents should never be ignored. Common culprits include:

• Musty smells: Indicate mold or mildew in the ductwork or system.

• Burning smells: Suggest overheating components or electrical problems.

• Rotten egg smell: May signal a natural gas leak (call your gas company immediately).

Clean air is essential for your health and comfort. If your HVAC system is distributing unpleasant or unsafe odors, it needs immediate attention.

6. Frequent Cycling or System Running Constantly

An HVAC system that turns on and off frequently (short cycling) or one that never seems to shut off could be trying to compensate for a problem. Possible causes include:

• Incorrect thermostat settings or faulty sensors

• Low refrigerant levels

• Undersized or oversized equipment

• Dirty filters restricting airflow

These issues can significantly shorten your system’s lifespan and waste energy. A trained technician can identify whether a simple fix or a more complex repair is needed.

7. Excessive Humidity or Moisture Around the Unit

HVAC systems should help regulate humidity indoors. If your space feels unusually humid or you notice condensation or leaks around the unit, it could be a sign of:

• A blocked condensate drain

• Refrigerant issues

• Poor system ventilation

Excess moisture can lead to mold growth, poor air quality, and water damage. Catching these signs early protects both your HVAC system and your property.

Many HVAC issues start small but escalate quickly if left unchecked. The good news? Most of the problems above can be addressed easily when caught early. Scheduling regular preventive commercial HVAC maintenance at least once a year can dramatically reduce the risk of emergency repairs and keep your system running efficiently.

Timely intervention could save you from a costly repair or replacement—and keep your facility comfortable year-round! If you’re noticing any of these warning signs, don’t wait. Call our team at Brody’s Welding to inspect your system today!