By Sydney Air Conditioning Experts · Updated May 2026
Ducted air conditioning systems in Sydney require annual professional servicing to maintain performance, energy efficiency, and system longevity. Sydney's long, hot summers put significant strain on air conditioning systems — filters block faster, condensate systems work harder, and refrigerant connections are stressed by thermal cycling. An annual service by a licensed technician costs $199 and includes filter cleaning, coil inspection, refrigerant pressure check, condensate drain flush, electrical connection check, and full performance test. This guide covers what's included in a ducted AC service, how to clean filters yourself between services, and the warning signs that indicate your system needs attention.
Annual Professional Service Checklist
A professional annual ducted AC service ($199) includes:
Return air filter inspection, cleaning or replacement
Indoor evaporator coil inspection and clean (chemical clean if needed)
Outdoor condenser coil clean
Refrigerant pressure check (identifies slow leaks before performance degrades)
Condensate drain flush (prevents water leak from blocked drain)
Electrical connection inspection (tighten terminals, check for corrosion)
Zone controller calibration and function test
Full system cooling and heating performance test
DIY Maintenance Between Services
Clean return air filter every 4–8 weeks during heavy use (monthly in Sydney summer)
Check all zone dampers are opening and closing correctly via the controller
Keep the area around the outdoor unit clear of vegetation (600mm clearance)
Wipe indoor diffusers clean of dust buildup every 3 months