How to Save Money on Air Conditioning in Brisbane
- Apr 16, 2026
- Troubleshooting
With electricity prices in Queensland continuing to rise, running your air conditioner efficiently has never been more important. The good news is that a few simple changes to how you use and maintain your AC can cut your cooling costs by 20-40% without sacrificing comfort.
At Sun City Air, we help Brisbane homeowners get the most out of their air conditioning systems. Here are our top strategies for reducing your aircon running costs while staying cool through Brisbane summers.
1. Set Your Thermostat to 24-25°C (Not 18°C)
This is the single biggest energy saver. Every degree below 25°C increases your energy consumption by approximately 10%. Setting your AC to 18°C on a 35°C day forces the system to work incredibly hard, and you probably will not notice the difference between 22°C and 24°C once the room has cooled down.
Our recommendation: Set cooling to 24-25°C during the day and 25-26°C at night. Your body naturally cools during sleep, so you need less cooling overnight.
2. Use Zoning If You Have Ducted AC
If you have a ducted air conditioning system with zoning, only cool the rooms you are actually using. Cooling empty bedrooms during the day wastes significant energy. Most modern ducted systems allow you to set up zones for daytime (living areas) and nighttime (bedrooms).
If your ducted system does not have zoning, it is one of the most cost-effective upgrades you can make. It typically pays for itself within 2-3 years through energy savings alone.
3. Clean or Replace Your Filters Regularly
A dirty filter restricts airflow, forcing your system to work harder and use more energy. In Brisbane’s dusty, subtropical climate, filters clog faster than you might expect — especially if you have pets, live near a construction site, or have trees close to your outdoor unit.
How often: Clean or check filters every 4-6 weeks during heavy use (October to March). A clean filter can reduce energy consumption by 5-15%.
4. Service Your System Annually
A professional air conditioning service keeps your system running at peak efficiency. During a service, your technician will clean the coils, check refrigerant levels, clear the drain line, and inspect electrical connections — all of which affect energy consumption.
An unserviced system can lose 5-10% efficiency per year. Over 3-4 years without servicing, you could be paying 20-40% more than necessary on your electricity bills.
5. Use Fan Mode and Timer Functions
Most modern air conditioners have features designed to save energy:
- Timer function: Set your AC to turn on 30 minutes before you get home rather than leaving it running all day. Modern inverter systems cool a room quickly.
- Sleep mode: Gradually increases the set temperature by 1-2°C over a few hours, saving energy while you sleep.
- Fan-only mode: Uses a fraction of the energy of cooling mode. On milder Brisbane days (under 28°C), fan mode with open windows may be sufficient.
6. Seal Your Home Against Heat Gain
Your air conditioner is only as efficient as your home allows it to be. If cool air is escaping through gaps, you are literally cooling the outdoors. Quick fixes include:
- Weather stripping around doors and windows — cheap and effective
- Door snakes or draft stoppers under external doors
- Curtains and blinds closed on sun-facing windows during the hottest part of the day, especially west-facing windows in the afternoon
- Ceiling insulation — if your home has less than R4.0 batts, upgrading insulation is one of the best investments you can make
7. Use Ceiling Fans With Your AC
A ceiling fan uses roughly 2-3 cents per hour compared to 25-70 cents per hour for an air conditioner. Running a ceiling fan alongside your AC creates a wind-chill effect that lets you set the thermostat 2-3°C higher while feeling equally cool. Over a full summer, this can save $150-300 on electricity.
8. Choose the Right Size System
An undersized system runs constantly and never reaches the set temperature, wasting energy. An oversized system short-cycles, which is also inefficient. If your system seems to run non-stop or cycles on and off frequently, it may be incorrectly sized for your space. Read our air conditioner sizing guide to check whether your system matches your room.
9. Keep Your Outdoor Unit Clear
Your outdoor unit needs clear airflow to reject heat efficiently. If it is blocked by plants, fences, or stored items, it works harder and uses more energy. Maintain at least 30 cm of clear space on all sides and ensure the top is completely unobstructed.
Also, if your outdoor unit is in direct afternoon sun, consider installing a shade structure above it (not around the sides — airflow must remain clear). A shaded outdoor unit can operate up to 10% more efficiently.
10. Upgrade to an Inverter System
If your air conditioner is a non-inverter (on/off) model, upgrading to an inverter system can reduce energy consumption by 30-50%. Inverter compressors adjust speed to match the cooling load rather than cycling between full power and off. They also maintain more consistent temperatures and run much quieter.
Modern inverter split systems from brands like Daikin, Mitsubishi, and Fujitsu are significantly more efficient than models from even 5-7 years ago. If your system is 10+ years old, the energy savings from a new unit can offset the installation cost within 3-5 years.
How Much Does Air Conditioning Cost to Run in Brisbane?
As a rough guide, based on average Brisbane electricity rates (around 30c/kWh):
- Small split system (2.5kW): approximately $0.20-0.35 per hour
- Medium split system (5.0kW): approximately $0.40-0.70 per hour
- Large split system (7.1kW): approximately $0.55-0.95 per hour
- Ducted system (10-14kW): approximately $1.00-2.50 per hour (depending on zones active)
These are approximate figures for inverter systems running at moderate load. Non-inverter systems cost roughly 30-50% more to run.
Need Help Reducing Your AC Running Costs?
Sun City Air offers professional servicing, system assessments, and energy-efficient upgrades across Brisbane, Moreton Bay, and the Redcliffe Peninsula. If your system is underperforming or your bills seem too high, we can diagnose the issue and recommend the most cost-effective solution.
Call us on 07 3283 5566 or request a quote online.
