A recent Canstar Blue survey found that many Australian households have cut down on using their air conditioning to save money on their electricity bills. Our research revealed that almost two in five survey respondents (38%) suspect air conditioning to be the largest contributor to electricity bills, so it’s no surprise that a similar number of people (33%) said energy-efficiency was their number one deciding factor when choosing an air conditioner.
You can look up the wattage of an air conditioner and calculate your annual appliance running costs on the Government of South Australia website but in the meantime, here’s our breakdown of the stats on electricity costs, whether you’re using your aircon for heating or cooling. We have assumed an electricity usage charge of 35c/kWh for these calculations.
How much does it cost to run an air conditioner for cooling?
The average reverse cycle air conditioner costs around $0.25 – $0.35 per hour to run for cooling purposes, depending on the size of the room. A medium-sized room of 36sqm would cost $0.36 – $0.70 per hour to run. In large areas (50sqm), it will cost between $0.70 and $0.95 per hour.
A portable refrigeration device costs about the same at $0.45 – $0.55 per hour.
The real winners on cost – but perhaps not on cooling ability – are ceiling fans and portable fans, at just $0.02 – $0.05 per hour depending on fan speed. Portable evaporative devices come in at a close second, costing around $0.06 – $0.07 per hour for electricity, plus less than $0.02 per hour for the water used by the device to cool the air.
A ducted whole-house reverse cycle air conditioning system is again the biggest money pit, at $2.45 – $3.45 per hour to run. That’s significantly more expensive than if you were using the system for heating, but if you want every inch of your house or office to be icy cool, well…
Cooling costs (Reverse cycle, split-system air conditioner)
The table below shows how much you might pay for cold air con over a year. Below the prices are usage assumptions for air con use, which take into account the energy efficiency of a device according to the Climate Zone you live in. For example, you’ll see that a Brisbane household will use much more than one in Melbourne, since the system has to work harder to balance out the hot external temperature.
|$46.08 (180kWh)||$62.28 (180kWh)||$51.84 (180kWh)||$28.55 (117kWh)||$34.40 (117kWh)||$26.44 (117kWh)|
|2.5–5kW||$181.00 (819kWh)||$72.19 (282kWh)||$97.57 (282kWh)||$81.22 (282kWh)||$43.92 (180kWh)||$52.92 (180kWh)||$40.68 (180kWh)|
|4–6kW||$283.76 (1,284kWh)||$112.13 (438kWh)||$151.55 (438kWh)||$126.14 (438kWh)||$68.08 (279kWh)||$82.03 (279kWh)||$63.05 (279kWh)|
Source: www.canstarblue.com.au – 17/09/2020. Average energy consumption figures based on reverse cycle, non-ducted, single split system air conditioners listed in the Commonwealth of Australia E3 Program’s Registration database. Capacity based on rated cooling capacity at 35°C. Usage cost estimates based on average electricity usage costs – 25.6 c/kWh in Sydney, 24.4 c/kWh in Melbourne, 22.1 c/kWh in Brisbane, 34.6 c/kWh in Adelaide, 29.4 c/kWh in Hobart and 22.6 c/kWh in Canberra. Average usage costs are based on rates available for an annual usage of 4,200 kWh. ^Climate zones based on the new Zoned Energy Rating Label for air conditioner models imported or supplied after 1 April 2020.
How much does it cost to run an air conditioner for heating?
It generally costs $0.13 – $0.36 per hour to use a reverse cycle air conditioner to warm a room.
An electric radiant heater costs about the same at $0.36 per hour, as does an electric panel heater at $0.43, but neither of these will heat as large an area. A gas heater costs more at $0.43 – $0.51 per hour.
A ducted whole-house reverse cycle air conditioning system costs the most, at $1.45 – $2.12 per hour, so make sure you really need it before pressing that button!
Heating costs (Reverse cycle, split-system air conditioner)
The table below reveals the annual costs of using your air con to heat, rather than cool. The usage figures below the costs reflect the demand for heating in each state, as well as how energy efficient an appliance can be depending on the climate zone. In this scenario, a Melbourne household uses significantly more hot air con than a Brisbane one, since it’s much colder there year-round.
Source: www.canstarblue.com.au – 17/09/2020. Average energy consumption figures based on reverse cycle, non-ducted, single split system air conditioners listed in the Commonwealth of Australia E3 Program’s Registration database. Capacity based on rated heating capacity at 7°C. Usage cost estimates based on average electricity usage costs – 25.6 c/kWh in Sydney, 24.4 c/kWh in Melbourne, 22.1 c/kWh in Brisbane, 34.6 c/kWh in Adelaide, 29.4 c/kWh in Hobart and 22.6 c/kWh in Canberra. Average usage costs are based on rates available for an annual usage of 4,200 kWh. ^Climate zones based on the new Zoned Energy Rating Label for air conditioner models imported or supplied after 1 April 2020.
Ducted Air Conditioner Running Costs
Ducted air conditioning is the undisputed king of cooling, but it comes at a cost. Not only are ducted aircon systems more expensive to install, but as the table below illustrates, they’re not cheap to run either.
|Hours per day||Summer cooling costs||Winter heating costs|
*Calculations assume cooling costs of $3/hour and heating costs of $1.80/hour, based on an electricity usage rate of 35c/kWh. Calculations assume stated usage per day for 90 days.
What costs more to run than an air conditioner?
- Kitchen appliances are a silent killer. Ovens cost $0.63 – $1.33 per hour to run. The stove costs $0.42 – $0.84 per hour per element being used. Gas stoves, ovens and grills cost slightly less than electric ones, at $0.48 per hour. Even the humble microwave costs $0.28 – $0.53.
- Cleaning appliances are more expensive to run than your air conditioner, with irons and vacuum cleaners both costing $0.41 – $0.82 per hour to run.
- Clothes dryers cost much more to run than your air conditioner, starting at $0.50 and typically costing anything up to $3.14 per hour to run.
- Lighting your home is very expensive. While running a single bulb can cost as little as $0.01 per hour for an energy-efficient compact fluorescent light, few people run just one bulb at a time. It can cost anything from $0.24 – $1.68 per hour to run several of the bulbs in your home at once. If you’re trying to cut back, you could try the “one light per room” or “one light per person in the house” rule.
- Swimming pools and spas cost a great deal in electricity because of the regular need to run the pool filter ($0.26 – $0.53 per hour) and chlorination equipment ($0.04 – $0.07). It’s even more expensive if you have a gas water heater ($4.00 – $17.00) or a solar water heater ($0.18 – $0.26).
What costs less to run than an air conditioner?
- Small appliances like computers, printers and phones cost less than 1 cent per hour to run.
- Heating water for showers, baths and washing accounts for 25% of the energy used in an average home. It costs $0.05 – $0.14 to run each bath.
- Dishwashers cost $0.12 – $0.56 per hour to run, in terms of electricity.
- TVs cost anything from less than 1 cent per hour up to $0.14 per hour for the larger plasma and LED models.
What about ceiling fans?
The humble ceiling fan is a great way to keep cool on the cheap. It obviously won’t be as effective as air conditioning, but it’s a reasonable alternative for warm days. Here are some estimated running costs for ceiling fans:
|Hours per day||Cooling costs|
Cheap Electricity Deals
While you’re here, why not take the time to compare energy plans in your area. Follow the links below to compare the cheapest deals on our database in your state.
How can I reduce the cost of using my air con?
We’ve established that air conditioners aren’t necessarily the Big Bad Wolf when it comes to your power bills. However, there is still the potential for your power bill to shock you if you’ve been running your aircon a fair bit through a particularly sweltering summer. Here are some easy tips to potentially minimise the effect aircon can have on your power bill:
- Consider an energy-efficient air conditioner: Energy-efficient air conditioners cost less to run and could save you lots in the long term. Remember, the more stars on an energy star rating, the more efficient the appliance.
- Set your air conditioner to the right temperature: Even slight changes to air conditioner temperature settings can add a surprising amount to your electricity bill.
- Consider alternatives to air conditioning: While modern air conditioners might not cost as much as you think, there are definitely cheaper alternatives. Consider evaporate coolers, ceiling fans,portable aircon units or practical cooling solutions.
- Buy when the time is right: Unit and installation costs of air conditioners can be fairly seasonal. Hold off on buying until the time is right.
- Keep your air conditioner clean: A well-maintained aircon unit will run more efficiently than one that has never been cleaned. The harder your system has to work to reach the temperature you have set, the more electricity it will use.
- Make sure you’re not paying too much for electricity: If you haven’t compared electricity plans recently, you might not be getting the best deal. Compare leading electricity retailers at Canstar Blue.