A well-maintained commercial HVAC system typically lasts 15 to 20 years, though the number varies by equipment type and how hard the building works it. Rooftop package units commonly run 15 to 20 years in the Los Angeles climate. VRF systems and split systems fall in a similar range. Commercial boilers and water-cooled chillers can last 20 to 30 years with proper water treatment and annual service.
What shortens lifespan is predictable: skipped maintenance, undersized or oversized equipment, dirty coils, refrigerant undercharge, and neglected belts or motors. What extends it is also predictable: twice-a-year service, clean filters, correct airflow, and catching small problems before they cascade. Once a system crosses 12 to 15 years and starts needing repeat major repairs, most owners save money by replacing rather than continuing to patch.
