HVAC System (Central Air): lifespan, maintenance and replacement

Typical lifespan: 15–20 years (about 17 years).

Maintenance schedule

• Inspect filters monthly; replace when dirty using the specified size/rating — Usually every 1–3 months
• Professional tune-up — Twice a year (spring & fall)
• Have coils, blower and condensate drainage checked — At professional service
• Have refrigerant performance checked; diagnose leaks rather than routinely topping up — At professional service
• Inspect ductwork for leaks — Every 3–5 years

Signs it needs replacing

• Frequent repairs needed
• Uneven temperatures between rooms
• Unusual noises (grinding, squealing)
• Rising energy bills
• An older R-22 system needing expensive or repeated repairs
• Excessive dust or humidity issues

Tips

Use the correct filter and keep airflow paths clear. A clean filter helps, but professional safety and performance checks still matter.