Replacing Old Air Conditioning Sydney

By Sydney Air Conditioning Experts · Updated May 2026

Most ducted and split system air conditioning units in Sydney have a practical lifespan of 12–18 years. Signs it's time to replace rather than repair include: the system is more than 15 years old, repair costs exceed 50% of a new system's price, the system uses R22 refrigerant (no longer available in Australia), energy bills have increased significantly, or the system runs constantly without reaching set temperature. Replacing a ducted system in a Sydney home typically costs $9,500–$17,800 for a complete new system including all ductwork. This guide helps you decide whether to repair or replace, what to look for in a replacement system, and what the process involves.

When to Replace vs Repair

• Replace if: the system is more than 15 years old AND has required 2+ repairs in the past 3 years
• Replace if: the repair quote exceeds 50% of a new equivalent system's installed price
• Replace if: the system uses R22 refrigerant (phase-out means R22 is no longer available — when it leaks, you cannot recharge it)
• Replace if: energy bills have increased significantly — a 15-year-old 3.5-star system uses 40–50% more electricity than a modern 6.0-star equivalent
• Repair if: the system is less than 8 years old and the repair is a single component (capacitor, PCB, fan motor)

Replacement Cost in Sydney

Replacing a ducted system in Sydney costs $9,500–$17,800 for a complete new installation. If the existing ductwork is in good condition (less than 10 years old), it can often be reused, reducing total replacement cost by $2,000–$4,000. Our technicians assess your existing ductwork at the free site inspection and advise on what can be retained.

Sydney Air Conditioning Experts — Call 0421 941 317 or email quote@sydneyaircon.net for personalised advice on any system.