Brisbane summers put real pressure on household power bills, and for most homes the air conditioner is the single biggest contributor. The good news is that a handful of small, practical changes can meaningfully reduce running costs without leaving you sweating through January. Here’s where to focus.
Set It Colder Than You Need To, and It Costs More
Every degree below about 24°C adds noticeably to your running cost, since the system has to work harder to fight the difference between indoor and outdoor temperature. Most homes are comfortable at 24–25°C in summer, especially with a ceiling fan running alongside to move air and make the room feel cooler than the thermostat reading. Set-and-forget at a sensible temperature will save more over a season than most people expect.
Use Zoning and Timers Instead of Cooling the Whole House
If you’ve got a ducted system with zone control, close off zones for rooms that aren’t in use — there’s no reason to cool bedrooms during the day or a home office at night. A timer or smart controller set to switch off an hour before you leave for work, and back on shortly before you’re home, avoids paying to cool an empty house without a cold start when you walk in.
Keep Filters and Outdoor Units Clear
A dirty filter restricts airflow and forces the system to run longer to reach temperature, which is one of the simplest and most overlooked drains on efficiency. Clean filters every four to six weeks through summer, and make sure the outdoor condenser unit has clear airflow around it — a unit crammed against a fence or overgrown with plants has to work harder to dump heat.
Block Heat Before It Gets Inside
- Close blinds or curtains on north and west-facing windows during the hottest part of the day
- Use block-out or reflective window film on rooms that cop direct afternoon sun
- Check roof and ceiling insulation — Brisbane’s older Queenslanders and post-war homes are often under-insulated by today’s standard
- Run exhaust fans in the kitchen and bathroom to clear heat and humidity rather than letting the aircon absorb it
Reducing how much heat gets into the house in the first place means the air conditioner isn’t fighting a losing battle all afternoon.
Check the System Is Actually Running Efficiently
An aircon that’s low on refrigerant, or that’s simply undersized or oversized for the room, will cost more to run regardless of how carefully you use it. If your system seems to be working harder than it used to for the same result, it’s worth reading our guide on choosing the right size air conditioner, or getting a technician to check whether a low gas charge is behind rising bills. A well-matched, well-maintained system is the single biggest factor in summer running costs — more than any thermostat habit.
Don’t Overlook the Electrical Side
Older switchboards and undersized circuits can mean an air conditioner is drawing more than it should, and appliances left on standby around the house add up over a full summer of higher usage. A safety switch and switchboard check is worth doing before peak season if your home hasn’t had one recently — see our guide on switchboard warning signs if you’re not sure whether yours needs attention.
Consider Off-Peak and Solar Timing
If you’re on a time-of-use electricity plan, or you’ve got solar, running the aircon and other high-draw appliances during daylight hours (when solar generation is highest) or off-peak windows can meaningfully cut what you actually pay, even if total usage stays similar. It’s worth checking your plan or asking your electrician whether your home would benefit from load-shifting.
Get a Service Done Before the Heat Peaks
The cheapest time to catch an inefficient system is before the hottest run of the year, not during it. A pre-summer service, covering a filter and coil clean, a check of refrigerant pressures, and a look at the outdoor unit’s condition, picks up small issues while they’re still small. Leaving it until a system is struggling through a heatwave usually means a longer wait for a technician and a bigger bill by the time it’s fixed.
Aircon Servicing and Electrical Checks Across Brisbane
Integrated Trade Services services and maintains split and ducted air conditioning systems, and carries out switchboard and safety-switch checks, across Brisbane and Moreton Bay. If you want your system running efficiently before the heat sets in, get in touch to book a service, or see our full air conditioning services.
Related guides
- Winter energy-saving electrical tips for Brisbane homes
- What size air conditioner do I need?
- Switchboard upgrades in Brisbane: costs & warning signs
Need a licensed Brisbane electrician? See our electrical services or get in touch for a quote.