By Sydney Air Conditioning Experts · Updated May 2026
The three biggest energy-saving changes a Sydney homeowner can make with air conditioning are: set the thermostat to 24–26°C in cooling mode (every degree lower increases running cost by 5–10%), use zone control to only cool occupied rooms, and ensure filters are clean before each season. Additional savings come from using timer scheduling (pre-cooling the home before peak afternoon heat rather than running continuously), closing blinds on west-facing windows before 2pm, and sealing gaps around windows and doors to reduce heat infiltration. This guide provides Sydney-specific energy-saving tips for ducted and split system air conditioning.
Top Energy Saving Actions — Ranked by Impact
1. Raise your cooling setpoint to 24–26°C — most impactful change. Each degree lower than 24°C adds 5–10% to running cost. 26°C with a fan is comfortable in most Sydney homes.
2. Use zone control properly — turn off zones in empty rooms. Running 3 of 6 zones saves 30–40% vs running the full system.
3. Pre-cool before peak heat — start cooling at 11am rather than 3pm. The system works harder (uses more energy) when the home is already 35°C than when it starts from 28°C.
4. Clean filters monthly in summer — a blocked filter increases running cost by up to 20% and risks damaging the system.
5. Close west-facing blinds by 1pm — reduces heat load on the AC by up to 15% on western-exposure rooms.
6. Set overnight timer — set temperature to 27–28°C overnight, not 22°C. Sleeping comfort doesn't require aggressive cooling.