Most articles that tell you what air conditioning costs to run just make a number up. We use the official government energy figures for real models, times the current median Sydney electricity rate, and we show our working. Here is what it actually costs, and where your own bill might land differently.
Where these numbers come from
Every air conditioner sold in Australia is energy-tested and registered under the government GEMS scheme, which records how much energy it uses per year for a given climate zone. We sync those official figures, and separately the median electricity rate across current Sydney residential plans, then work out the yearly cost for each model. Nothing here is invented or rounded for effect.
We refresh both sets of figures every month, so the costs below move with the actual Sydney electricity rate rather than sitting frozen at whatever they were the day this was written.
What it costs to run, by size
Here is the estimated yearly cooling cost across a range of sizes, smallest to largest, at the current Sydney rate. Each one links to the model so you can see its full figures.
As a rough read: a small bedroom split is cheap to run, and cost climbs with capacity because a bigger system moves more heat. But size is not the whole story, which is the next part.
| System | Size | Cooling use | Est. yearly cooling cost |
|---|---|---|---|
| Daikin Cora 2kW | 2 kW | 127 kWh/yr | $44/yr |
| MHI Ciara 3.3kW | 3.3 kW | 285 kWh/yr | $99/yr |
| Daikin Alira X 4.6kW | 4.6 kW | 337 kWh/yr | $117/yr |
| Samsung Aero 6.8kW | 6.8 kW | 633 kWh/yr | $220/yr |
| LG DUALCOOL AI 9.4kW | 9.4 kW | 879 kWh/yr | $305/yr |
| Carrier QSH High Static 13.6kW | 13.6 kW | 1044 kWh/yr | $362/yr |
Source: Australian GEMS registry · median of 170 Sydney residential tariffs · Refreshed monthly · Last updated June 2026
Why your own bill might differ
These are honest estimates, not a prediction of your exact bill, and it is worth being clear about that. The GEMS figure is measured under a standard test, so it assumes a typical amount of running. If you cool one room for a couple of hours on hot evenings, you will spend less; if you run a whole home all summer, more.
Your actual cost also depends on the electricity plan you are on, how well the room holds temperature, and whether the system is sized correctly for the space. The table is best used the way we use it: a fair, like-for-like comparison between systems, not a crystal ball.
Efficiency moves this more than you think
Two systems of the same size can use noticeably different amounts of energy. That is what the energy star rating is really telling you, and over years of running it adds up. When you are comparing options, the cheapest unit to buy is not always the cheapest to live with.
You can line systems up side by side on our compare page, and every model page shows its own running-cost figure calculated the same way as the table above.
Keeping running costs down
The three things that matter most are simple: the right size for the room, an efficient model, and a proper install so the system runs the way it was designed to. Get those right and the running cost looks after itself.
If you want a hand, our capacity calculator sizes it for your space in about thirty seconds, or send us a few photos and we will recommend an efficient system that suits the room and give you a fixed price.