By Sydney Air Conditioning Experts · Updated May 2026
Air conditioning systems in Sydney should be professionally serviced once every 12 months for residential use, or every 6 months for heavy-use or commercial installations. Sydney's long summers mean most residential AC systems run for 5–7 months per year — significantly more than in cooler climates — making annual servicing essential rather than optional. Between professional services, clean your split system filters every 4–8 weeks and your ducted return air filter every 3 months. Signs your system needs an unscheduled service include: reduced cooling performance, unusual noises, water leaking from the indoor unit, or a noticeable increase in electricity bills.
Recommended Service Intervals
Residential split system (light to moderate use): once every 12 months, ideally in autumn before winter or in spring before summer
Residential ducted system (regular use): once every 12 months — filter check every 3 months
Rental property split system: once every 12 months, ideally between tenancies
Commercial or heavy residential use (8+ hours/day): every 6 months
Signs You Need a Service Now (Don't Wait)
System runs but room is not reaching set temperature in normal conditions
Unusual noise — rattling, grinding, or squealing from indoor or outdoor unit
Water dripping from the indoor unit onto the wall or floor
Electricity bills have increased noticeably without change in usage
Musty or burning smell when the system starts
Book a service online or call 0421 941 317 — same-week appointments available across all Sydney suburbs.