Air Conditioner Running Cost Calculator: AU Guide

An air conditioner running cost calculator is one sum: the energy the system uses in kWh, multiplied by your electricity tariff. You get the kWh from the energy rating label or the input power, scale it to the hours you actually run it, then multiply by the rate on your own bill. Here’s how to do each step with your own numbers.

How does an air conditioner running cost calculator work?

Every running cost calculator does the same thing. It works out how many kilowatt hours (kWh) the system uses, then multiplies that by the price you pay for each kWh.

The Energy Rating site’s own guide to the Zoned Energy Rating Label sets out the formula: annual running cost equals total energy use in kWh multiplied by your electricity tariff.

Step 1: read the kWh off the energy rating label

Split systems sold in stores carry the Zoned Energy Rating Label. To the right of the stars, it shows the estimated energy use in kWh per year, with cooling in blue on top and heating in red, for the hot, average and cold climate zones.

Not sure which zone you’re in? The Energy Rating Calculator finds it from your postcode, and it compares the running costs of labelled models. Our guide to the air conditioner energy rating explains the stars.

Step 2: scale the label figure to your own hours

The label figure is based on an assumed number of hours. Energy Rating states the hot zone figure assumes 2,247 hours of cooling a year, the average zone 840 hours and the cold zone 545 hours. Your home will run more or less than that.

1. Find kWh per hourDivide the blue cooling figure for your zone by that zone’s hours.
2. Count your hoursMultiply the hours you run it on a typical day by the days you use it.
3. Multiply the twokWh per hour times your hours gives your kWh for the season.

No label? Use the input power

The model’s specifications list a rated cooling input power in kW. Multiply it by your hours to get kWh. That’s the draw at full rated output, and an inverter system usually runs below it once the room is cool, so treat the result as the high end.

Watch the units. A figure in watts divides by 1,000 to give kW, so 1,200 W is 1.2 kW.

Step 3: turn kWh into a cost with your own tariff

Find the rate per kWh on your bill. Energy Rating says it’s in the service calculation section. Multiply your kWh by that rate and you have your running cost. If the rate is in cents, divide by 100 to get dollars.

On a time of use plan, the rate changes during the day. Split your hours by time window and multiply each window’s kWh by its own rate. Our guide to air conditioner running cost goes into the label in more detail.

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Ways to bring the number down

Energy Rating’s heating and cooling page gives these tips. Each one lowers the kWh, so it lowers the cost whatever your tariff is.

• Set it between 25 and 27 degrees in summer. Each degree of extra cooling increases energy use by about 5 to 10%.
• Clean the filters. Dirty filters significantly reduce airflow and the efficiency of the unit.
• Use sleep mode at night and a timer, so it isn’t running when it’s not needed.
• Run a ceiling fan with it, so the system does less work.

Size matters too. Energy Rating says a system that’s too small works harder, and one that’s too big costs more upfront and to run. Our air conditioning service in Brisbane covers filters and coils, and our guide on what size air conditioner you need helps with sizing.

Common questions about running cost

Can I compare two models this way?

Yes, if they’re a similar size. Energy Rating says star ratings of different capacity models can’t be compared, so compare the kWh of models with similar capacity and features.

Does heating work the same way?

Yes. Use the red heating figure and the heating hours for your zone. In the hot zone, the label assumes 277 heating hours a year.

Why doesn’t my bill match my estimate?

Energy Rating notes that your actual use may differ from the label. Your hours, set temperature, room and weather all change it, so check your estimate against a few bills.

Information checked 5 October 2026. Sources: Energy Rating (Australian Government), “Understand the Zoned Energy Rating Label” and “Heating and cooling”. Tariffs differ by plan, so use the rate on your own bill. This article is general information. It is not advice about your home.

Related guides

How to Prevent Air Conditioner Short CyclingAir Conditioner Replacement Cost Brisbane: 7 Key FactorsAir Conditioner Service Cost: What to Expect

• Best Air Conditioner Brands in Australia
• Air Conditioner Repair Cost: A 2026 Guide

All guides: electrical and air conditioning guides.

Written by the Faze Electrical & Airconditioning team, Woodridge

Licensed electricians and ARCtick refrigeration technicians, Queensland Electrical Contractor Licence 90552 and ARCtick L181564. We install and service split systems and do the electrical across Logan, Brisbane southside, Ipswich and the northern Gold Coast.

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