Ducted air conditioning has a reputation for being lovely to live with and brutal on your power bill. It is the number one worry we hear from Geelong homeowners weighing up a whole-home system. So here are the numbers nobody seems to explain properly, and the good news is that Victoria comes out looking rather well.
The truth is that running cost depends far more on how a system is designed and used than on the fact that it is ducted. Two identical homes can see wildly different bills from the same system, and the difference is rarely the badge on the unit. It is zoning, insulation, the temperature you set, and how many hours it runs. It is worth being clear-eyed here, because the scare stories about thousand-dollar summer bills usually come from cooling an entire empty house on the hottest tariff of the day. Get the basics right and a modern ducted system is far more affordable to run than most people fear.
Let us put some real figures on the table. Bear in mind these are guides, not quotes, because your home, tariff and habits all shift the total:
Why does Victoria come out so far ahead? Our summers are milder and shorter than the northern states, so a well-designed system simply does not have to run as hard or as long. For Geelong, with its bursts of real heat rather than months of it, that is exactly the pattern that keeps costs manageable. And because our winters are genuinely cold and damp, a reverse cycle ducted system quietly earns its keep for months when the cooling is switched off entirely. You are buying year-round comfort, not a summer-only luxury.
The biggest savings come from how you run the system, and none of it is complicated. Lean on your zoning and only cool the rooms in use, rather than the whole house out of habit. With a modern inverter system, set a comfortable steady temperature of around 24 degrees and let it hold there, rather than constantly flicking it on and off, which forces the compressor to work harder each time it restarts. Every degree cooler you demand costs more power, so a sensible setpoint makes a real difference over a long summer. Good insulation, closed curtains during the hottest part of the day, and clean filters all help the system do less work for the same comfort.
Pairing your ducted system with Advantage Air smart zoning makes all of this effortless, letting you schedule and control each zone from your phone. It is the difference between guessing and actually managing what you spend.
Every home is different, and the only way to know your true running cost is to have the system sized and designed properly for your place. An oversized or poorly zoned system is what turns a reasonable bill into a painful one, which is exactly why expert design matters more than the brand you choose. Fitting an energy-efficient system from a trusted name such as Daikin, Mitsubishi Electric or Fujitsu General, sized correctly for your home, is the surest way to keep those summer numbers low.
Stewart Air Conditioning is a local, owner-operated business run by Andrew, who designs each system around your home and your budget so you stay comfortable without dreading the bill. Want a straight answer on running costs for your home? Get a free quote today, or call Andrew directly on 0449 611 323. You can also explore efficient options on our home page.

andrew@stewartaircon.com.au
0449 611 323
VBA number: 104172
ARC Licence: L136269
RTA number: RTA-AU62518