Preventive maintenance is the most cost-effective strategy for extending the life of your commercial HVAC system. A structured checklist ensures nothing is missed and helps avoid expensive emergency repairs. Below is a comprehensive guide covering what should be inspected, serviced, and replaced throughout the year.
Monthly tasks
- Inspect and replace air filters as needed — clogged filters restrict airflow and increase energy use
- Check thermostat settings and calibration to ensure accurate temperature readings
- Inspect condensate drain lines for blockages that can cause water damage
- Verify that all supply and return vents are unobstructed
Quarterly tasks
- Belt inspection: Check fan belts for wear, tension, and alignment
- Electrical connections: Tighten all connections and check for signs of overheating
- Lubrication: Grease bearings on motors, fans, and pumps as per manufacturer specifications
- Control testing: Verify BMS sensors and actuators respond correctly
Seasonal tasks
Before cooling season
- Clean evaporator and condenser coils thoroughly
- Check refrigerant charge levels and inspect for leaks
- Test cooling tower water treatment and basin condition
- Calibrate economiser dampers for free cooling operation
Before heating season
- Inspect heat exchangers for cracks or corrosion
- Test ignition systems and safety controls on gas-fired equipment
- Check boiler pressure relief valves and expansion tanks
- Verify ductwork insulation is intact, especially in unconditioned spaces
Buildings that follow a structured preventive maintenance program experience 30–40% fewer breakdowns and extend equipment lifespan by 5–10 years on average.
Annual tasks
- Full duct inspection and cleaning assessment per AS 3666
- Comprehensive vibration analysis on major rotating equipment
- Complete airflow balancing across all zones
- Review and update the building’s maintenance log and compliance documentation
A proactive maintenance program pays for itself through reduced energy costs, fewer breakdowns, and longer equipment life. Contact Air Environmental to develop a tailored maintenance plan for your facility.