Orange County Commercial HVAC Maintenance: A Seasonal Checklist for Building Owners

Orange County is easy on HVAC equipment for part of the year and very hard on it for the rest. Coastal mornings, inland heat that can sit in the 90s and above, dry Santa Ana winds that carry dust and smoke, and long cooling seasons all add wear. A simple seasonal routine is the cheapest insurance a building owner can buy.

Spring: get ready for cooling season

• Replace filters and confirm the right size and rating for each unit.
• Clean condenser and evaporator coils; straighten damaged fins.
• Check refrigerant charge and look for oil spots that suggest a leak.
• Inspect belts, pulleys and motor bearings on rooftop units and air handlers.
• Clear condensate drains and pans before the first humid week.
• Test economizers and dampers, and check thermostat or building-control schedules.

Summer: protect the peak

• Watch for warm spots and tenant complaints — they are early warnings.
• Check filters again on busy or dusty sites.
• Review energy bills and run-times for units working harder than last year.

Fall: wind, smoke and heating prep

• Before Santa Ana wind events, stock spare filters and check outdoor units for debris.
• Inspect heat exchangers, burners and ignition on gas-fired equipment.
• Test heat pumps in heating mode and confirm reversing valves switch cleanly.
• Verify carbon monoxide and safety controls.

Winter: review and plan

• Look back at the year's service calls: which units failed, and why?
• Budget for equipment near the end of its useful life before it fails in July.
• Ask about controls or energy management upgrades while cooling demand is low.

When to call right away

No cooling or heat in an occupied building, water leaking from equipment, burning smells, or repeated breaker trips need a technician now. We answer 24/7 across Fullerton, Orange County and Greater Los Angeles.