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Tell us the house and the question
Call or message with the basics - house type, rooms, what you are weighing up. Two minutes of context makes the advice worth having.
Real hourly numbers, not retailer spin. A bedroom split costs about 40 to 60 cents an hour. Here's the rest.
How Much Does Air Conditioning Cost to Run in Sydney?
Running Costs
The Straight Numbers
What each system type actually costs per hour in Sydney, and what makes the bill blow out.
How much does air con cost to run in Sydney? A modern 2.5kW bedroom split costs roughly 40 to 60 cents an hour at full cooling. A 7.1kW living area unit runs about $1.20 to $1.80 an hour. A zoned ducted system cooling the whole house sits around $2 to $4 an hour at peak, much less once the house is at temperature. Run a split all evening through summer and you're looking at roughly $50 to $90 a month on the bill.
The numbers above assume a healthy, correctly sized inverter system. A dirty or undersized one can cost double for the same comfort - the unit runs flat out for hours instead of cruising. If your bill jumped and your habits didn't change, the air con is usually struggling, not greedy.
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Quick Numbers
Hourly Running Costs by System
Sydney rates, modern inverter systems, full cooling load.
2.5kW bedroom split: $0.40 to $0.60 per hour
The cheapest cold air in the house. Run it all night, every night of January, and it adds maybe $40 to $60 to the quarterly bill.
5kW to 7.1kW living area split: $0.80 to $1.80 per hour
Open-plan living areas need the bigger units. The range depends on size, ceiling height and how hard the western sun hits.
Ducted whole home: $2 to $4 per hour at peak
That's pulling the whole house down on a 38 degree day. Once at temperature, an inverter ducted system cruises well below that - and zoning cuts it further.
The struggling system tax: up to double
Packed filters, dirty coils, low gas or the wrong size all force longer run times for the same cooling. A $250 service often pays for itself in one summer.
What Actually Drives the Bill Up
Four things, in order. First, dirty filters and coils - airflow drops, run times stretch, and the unit works harder for less cold. Second, low gas from a slow leak - the system runs longer to do the same job, and most owners don't notice for a year. Third, wrong sizing - an undersized unit never stops running on hot days, and an oversized one short-cycles and wastes power on every start. Fourth, old gear - a 15-year-old fixed-speed unit can use half as much again as a modern inverter for the same room.
If your summer bill jumped, check the cheap stuff first: wash the filters, make sure the outdoor unit isn't choked with leaves or cobwebs. If it's still chewing power, see our high power bills page or book a service.
Common Factors
What's Actually Gone Wrong
The factors that set your running costs, most important first.
Does aircon heating cost the same as cooling?
Reverse-cycle heating is actually cheaper per degree than cooling in mild weather, and far cheaper than plug-in electric heaters. It’s the cheapest heating in most Sydney homes.
What temperature should I set to keep costs down?
Aim for 23 to 24 degrees in summer. Every degree colder adds roughly 10 percent to the running cost. Setting it to 18 doesn’t cool the room faster, it just runs longer and costs more.
Do ceiling fans help?
A lot. A fan lets you set the aircon 2 to 3 degrees warmer for the same feel, which knocks 20 to 30 percent off the running cost. Run both.
Does zoning really save money on ducted?
Yes – it’s the single biggest saver on ducted. Cooling two zones instead of the whole house roughly halves the load. If your ducted system has no zoning, ask us about adding it.
On All Day or On When You're Home?
For modern inverter systems, holding a steady temperature is efficient - the compressor idles along once the room is there. But leaving it running in an empty house all day still costs more than turning it on when you get home, unless the house is well insulated and the afternoon is brutal. The practical answer: time it to start 30 minutes before you get home. You walk into a cold house without paying to cool an empty one. We cover this in more detail on our power bills page.
Diagnosis Process
Think Your System Costs Too Much to Run?
A $250 plus GST service tells you exactly where you stand - pressures, electricals, airflow, coil condition - and most of the faults that inflate bills get fixed on the spot. Since 1991, 4.8 stars from 280+ reviews. (02) 9820 4500.
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We measure, not guess
Sizes come from volume and glass, verdicts come from testing. No brochure numbers, no sight-unseen quotes.
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You get the numbers and the options
Real installed prices, repair-versus-replace maths, and the trade-offs in plain English. You decide with the facts in front of you.
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Fixed quote before any work
The price agreed is the price paid, and installs and repair parts carry lifetime workmanship warranty.
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Fixed quote before we fix
Once we know the fault, we quote the repair before we start. You decide. Most jobs get done same visit.
Real Jobs
Sizing Is Half the Running Cost
The cheapest system to run is the correctly sized one. Before you buy anything, run your rooms through our sizing calculator and check real installed prices on the pricing guide. Two minutes now saves 15 years of oversized power bills.
Honest Numbers, Local Crew
We'd rather tell you a fan and a filter wash will fix your bill than sell you a new system. Family run since 1991, fixed pricing, licence 273312C, ARCtick AU13058. Give us a bell on (02) 9820 4500.
Related reading: should you leave it on all day, ducted installed prices, and the government Energy Rating site for comparing unit efficiency.
FAQ's
Air Con Running Costs - Common Questions
A 2.5kW split costs about 40 to 60 cents an hour at full cooling. A 5kW unit is roughly 80 cents to $1.20, and a 7.1kW up to $1.80. Once the room is at temperature an inverter drops well below those figures.
Run a zoned ducted system through a hot Sydney evening, say 5 hours, and you’re looking at roughly $6 to $12. Unzoned and cooling the whole house all day, it can triple that.
If your habits didn’t change, the system is working harder for the same result – usually dirty filters or coils, low gas from a leak, or a component on the way out. A service finds it.
A fan costs about 2 cents an hour and an air conditioner 20 to 90 times that – but a fan doesn’t cool the air, it cools you. The cheapest comfortable setup is both: aircon at 24 with the fan on.
Yes. A 15-year-old fixed-speed unit can use 30 to 50 percent more power than a modern inverter doing the same job. If yours is that age and the bill hurts, the replacement maths is worth a look.
Jay’s Air. A standard service is $250 plus GST and covers pressures, electricals and coil condition – the three usual cost culprits. Family run since 1991, 4.8 stars from 280+ reviews. (02) 9820 4500.