Air conditioner running costs in Australia (2024)

Anula Wiwatowska
Oct 09, 2024
Icon Time To Read4 min read
// Cool it

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Three things are unavoidable during Australian summer; mosquitos, sunburn, and using the air conditioning. With soaring temperatures from the early morning, the cost of running the aircon over summer can add up, but how much depends on a few factors.

Prices vary depending on how big your air conditioner is, how long you run it for, and of course how much you pay per kilowatt on your electricity bill. All up it can be a costly expense, but thanks to heat pump technology it isn't as bad as it could be.

There are plenty of variables, but we've pulled together the info to help you figure out how much to budget for your summer electricity bill.

How much does it cost to run the air conditioner over summer?

Air conditioners tend to have a higher advertised wattage than heaters, but thanks to heat pump technology they can actually be cheaper to run.

Air conditioners, be they split-cycle, or portable, have an input power wattage and a cooling capacity. Although both are measured in watts, only the input power dictates how much power the appliance has to pull from the grid. The cooling capacity indicates how efficiently the air conditioner can use the input power, and how large of a space it can handle. On average a split-cycle air conditioner will run at around 300% efficiency, meaning that each kW of power can cool around three units of heat. These numbers vary depending on the make and model, but while an air conditioner might have a cooling efficiency of 4500w, it may only use 1800w of power.

To find out how much your air conditioner will cost you to run, you'll only need to know the input power wattage. The higher this number is, the more expensive the device will be to operate.

Based on last year's average electricity pricing across the country ($0.14kW/h), it can cost as low as $92.74 to run an efficient portable air conditioner for the season. Naturally that number will change depending on a bunch of factors like how much you pay for electricity, the aircon model, and how long you run it for. In order to determine exactly how much your air conditioner will cost you to run, you'll need to know;

  • The input wattage for your device
  • Your kw/h usage charges from your electricity company (and any peak charges)
  • How long you plan on running your air conditioner for each day

When you have these numbers you simply need to multiply your Kw/h cost, by the input wattage to determine how much that device will cost per hour. From there you can multiply that number by how many hours per day you’ll likely use your heater, and again by how many days across summer (92). The formula looks like this;

Air conditioner
Summer cost = 92 (hours aircon is on per day (kw/h charge x input power kilowattage) )

Air conditioner running costs compared

If you'd rather someone else do the math for you (you're welcome), you can take a look at the chart below. We used the average costs of electricity across Australia to calculate the approximate cost per hour, and the cost if you were to run your aircon for 8 hours a day over the summer months. Once again we are only looking at the input power wattage, we cover the cooling efficiency in another guide.
Input power
Cost per hour
Average cost to run over summer
800w$0.11$80.64
1000w$0.14$100.80
1200w$0.17$120.96
1400w$0.20$141.12
1600w$0.22$161.28
1800w$0.25$181.44
2000w$0.28$201.60
2400w$0.34$241.92
2800w$0.39$282.24
3200w$0.45$322.56

What type of air conditioner is cheapest to run?

Split cycle air conditioners are cheaper to run than portable air conditioners, but by and large you'll want to look for one with a low operating wattage and a high cooling capacity. When you divide the later by the former  (and times it by 100) you'll get the cooling efficiency in a percentage. The higher that percentage, the faster the device can cool the space, and the better bang-for-your-buck the air conditioner will be.

If you're not able to install a wall air conditioner than portable aircons are a solid option. These tend to have a 1:1 ratio for operation and cooling wattage however, so you'll want to pick something smaller if you're concerned about the running costs.

Portable air conditioner running costs

For the most part portable air conditioners aren't particularly energy efficient to use. Many, especially cheap units, tend to have a 100% efficiency, meaning the input power is the same as the cooling capacity. This means that what you see, is what you get. It isn't neccessarily a bad thing. It makes it easier to pick out a unit, and there are still plenty with a low enough wattage to not entirely break the bank. 

In saying that, there are portable air conditioners with surplus cooling efficiency similar to split-systems. Dimplex makes some excellent units that run at over 250% efficiency, and will only set you back around $0.25 per hour to run, plus they're pretty affordable to buy outright. On the other end of the spectrum, there are some where the input power outdoes the cooling capacity. Avoid these at all costs.

Split cycle air conditioner running costs

Split cycle air conditioners might be more expensive in the short term, but they can be surprisingly affordable to run over their lifespan, especially in larger spaces. While the cost per kW remains the same regardless of the type of cooling device, split cycle aircons can cool air 3-6 times more efficiently and therefore require a lower wattage to service a larger space. This ultimately means a 3.2kW system could perform as effectively as a 9.6kW, so it won't need to be run for as long to have the same impact on a space. 

At the lower end, a split cycle with 3.2kW input power will cost around $0.45 per hour to run, but larger systems can set you back over $1 per hour.

Anula Wiwatowska
Written by
Anula is the Home and Lifestyle Tech Editor within the Reviews.org extended universe. Working in the tech space since 2020, she covers phone and internet plans, gadgets, smart devices, and the intersection of technology and culture. Anula was a finalist for Best Feature Writer at the 2022 Consensus Awards, and an eight time finalist across categories at the IT Journalism Awards. Her work contributed to WhistleOut's Best Consumer Coverage win in 2023.

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