Electricity in NSW isn’t getting cheaper. Ausgrid network charges are lifting another 9.7% into 2026-27, and the average household bill now sits at around $1,850 per year. So the question every Sydney homeowner is asking us is simple: what does my air conditioner actually cost to run? Here are the real 2026 numbers, based on current Ausgrid tariffs and the systems we service every week.
The Short Answer
On typical Sydney tariffs, a modern ducted reverse-cycle system costs about $1.20 to $3.80 per hour to cool in summer. A small split system in a bedroom runs closer to $0.22 to $0.45 per hour. The difference adds up fast across a summer.
Quick-Reference Running Cost Table
Figures based on current NSW Ausgrid single-rate tariffs around 40.18c/kWh, with peak time-of-use windows pushing up to 64.87c/kWh.
How NSW Tariffs Change the Maths
Most Ausgrid-network homes are on Time of Use tariffs in 2026. The three windows that matter:
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Peak (2pm to 8pm weekdays in summer): around 55c to 65c per kWh
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Shoulder: around 30c per kWh
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Off-peak (10pm to 7am): around 22c per kWh
Running ducted from 4pm to 8pm on a 40-degree day puts every minute inside the peak window. Running a bedroom split from 10pm to 6am is entirely off-peak — roughly half the cost per kWh.
The simple formula: Running cost = kWh used × your tariff in dollars per kWh + the daily supply charge (around $1.09/day in Ausgrid zones).
Five Ways to Cut Running Costs Right Now
1. Set 24°C in summer, 20°C in winter.
Every 1°C cooler in summer adds around 10% to your bill. Small setting changes, big cumulative savings.
2. Use zoning.
On ducted, running two zones instead of five cuts draw by 40 to 60%. If you’re only using the living room, don’t pay to cool the bedrooms.
3. Shift to off-peak where possible.
Pre-cool the house before 2pm and coast through the peak window. Well-insulated homes can hold temperature for hours.
4. Clean filters every three months.
Dirty filters add 5 to 15% to energy use by forcing the system to work harder for the same output.
5. Service annually.
A refrigerant top-up, coil clean and fan inspection can restore 10 to 20% of lost efficiency on older units.
Is It Worth Upgrading an Old Unit?
If your system is 10 years old or more and non-inverter, a new 5-star inverter will typically cut running costs by 30 to 40%. On heavy users, that pays for itself in six to eight years — faster if you’re staying in the home long-term.
The efficiency gap between a 2014 fixed-speed unit and a 2026 inverter is genuinely significant. You feel it in the bill and in the noise level.
Rebates in NSW (2026)
Under the NSW Energy Savings Scheme, reverse-cycle upgrades from old electric heating can attract rebates of up to $4,400 depending on the unit and the installer. Worth asking about before you commit to a new system.
Frequently Asked Questions
What’s the cheapest air conditioner to run in NSW?
A modern 5-star inverter split system in a single well-insulated room, running on off-peak — under 30 cents per hour in 2026.
Does ducted or split cost more to run per hour?
Per hour, ducted draws more because it’s cooling more space. Per square metre cooled, modern zoned ducted is competitive with multiple splits.
Are solar panels worth it to offset air con?
Yes — especially if you run ducted heavily between 12pm and 4pm in summer. Solar output aligns almost perfectly with peak cooling load.
How much does it cost to run a split system all night?
A 2.5 kW bedroom split on off-peak eco mode costs around $1.20 to $1.80 per night in 2026.
Does leaving it on all day cost less than turning it on and off?
For modern inverter units, keeping it at a steady temperature while you’re home is usually more efficient than big on/off cycles. For when you’re out for more than two hours, turning it off wins.
Want a System Sized Right for Your Home?
Oversized units short-cycle and waste power. Undersized units run flat out and wear early. Both cost you more to run than they should. Book a free heat-load assessment with Jay’s Air Conditioning and we’ll spec a system sized right for your home, your tariff, and your actual usage pattern.