What Is the Best Aircon Temperature in Australia?
For most Australian homes, finding the best aircon temperature is about balancing indoor comfort with manageable energy consumption. Rather than setting the unit to the lowest possible level, the goal is to identify a point that maintains a stable environment without significantly increasing power usage.
Selecting an appropriate setting aligns with official energy conservation guidelines for efficient cooling. The best aircon temperature for a specific space may shift depending on regional heat, afternoon sun exposure, and whether the objective is to mitigate extreme temperatures or maintain comfort during a standard warm day. This article explores the temperature ranges that provide the most functional results, the cost implications of lower settings, and practical methods for staying cool while controlling electricity expenses.
What Is the Best Aircon Temperature in Summer?
In summer, the best aircon temperature for most Australian homes is usually 25 to 27°C. That range is widely recommended because it keeps the room comfortable while avoiding unnecessary power use. To refine your settings for maximum efficiency, it is worth considering how seasonal shifts, regional climates, and specific daily activities influence your cooling needs.
Seasonal Recommendations
The ideal temperature setting changes significantly between the cooling and heating months.
Season | Recommended set point (°C) | Rationale |
Summer | 25–27 | Best balance of comfort and efficiency for typical homes. |
Spring / Autumn (shoulder) | 24–26 (cooling) / 18–20 (heating) | Use passive measures (shading, cross-ventilation) and only call the aircon when needed. |
Winter (heating) | 18–20 | Occupied rooms only; lower when rooms are unoccupied to save energy. |
Regional Adjustments
Because Australia spans multiple climate zones, the best aircon temperature may also vary depending on your location.
Region / climate (examples) | Summer (°C) | Winter (°C) | Practical tip |
Tropical, humid (examples: Queensland, northern New South Wales) | ~25 | ~20–22 | Use dehumidify mode and ceiling or pedestal fans to reduce perceived humidity rather than lowering temperature; keep curtains closed during daytime. |
Hot, dry (example: Perth and inland areas) | ~25–27 | ~16–18 | Dry heat feels less oppressive; exploit cool nights for natural ventilation and relax set points overnight where safe. |
Temperate south (examples: Melbourne, Adelaide, Hobart) | ~25–27 | ~18–20 | Combine shading, insulation and zoned cooling/heating; cool or heat only occupied zones to save energy. |
Best Temperature for Different Scenarios
Adjusting your thermostat based on the current situation can significantly reduce unnecessary power draw.
For Sleeping: To ensure a restful night without overcooling, a range of 17°C to 22°C is recommended. The body’s temperature naturally drops during sleep, so a slightly higher setting is often sufficient.
During a Heatwave: When outdoor temperatures soar, avoid the temptation to set the aircon to its lowest point. Maintaining a steady 26°C or 27°C prevents the system from overworking and reduces the risk of straining the local power grid.
Energy Saving: If the goal is to keep costs as low as possible while beating the heat, aim for a setting of 26°C or higher in summer. Combining this with ceiling fans can make the room feel up to 3°C cooler without the additional energy draw of a lower aircon setting.
Why Temperature Choice Dictates Your Aircon’s Power Consumption
Understanding the direct relationship between aircon settings and energy consumption is essential for managing household expenses. Space cooling and heating account for a significant portion of average home energy use, and even minor adjustments to your aircon temperature can lead to noticeable changes in your quarterly electricity statement.
The Energy Consumption Ratio
Every degree the thermostat is set below 24°C in summer increases the energy consumption of the unit by 5% to 10%. For example, lowering the setting from 24°C to 21°C can increase the cooling portion of a bill by up to 30%. This occurs because the compressor must operate for longer durations and at higher intensities to maintain the lower target temperature.
Ambient Temperature Differential
Cooling costs are influenced by the difference between the outdoor ambient temperature and the indoor setting. On a 35°C day, maintaining an indoor environment of 25°C is more efficient than attempting to reach 20°C. A larger gap between the external heat and the thermostat setting requires the system to draw more power, leading to increased peak demand charges.
Long-Term Hardware Efficiency
Operating an air conditioner at excessively low temperatures affects the longevity of the system. Maintaining a unit at maximum capacity for extended periods increases wear on the motor and compressor. Choosing a moderate, efficient setting reduces maintenance requirements and extends the service life of the equipment, providing financial benefits beyond the immediate billing cycle.
Practical Ways To Cut Your Cooling Bill Beyond Your Aircon
While maintaining the best aircon temperature is a primary factor in managing electricity expenses, several complementary strategies can further reduce the load on your cooling system. Implementing these practical measures helps maintain a comfortable indoor environment without solely relying on continuous air conditioning.
Utilise Passive Cooling Techniques
To prevent heat from entering the home, use external shading and high-quality window coverings. Closing blinds or curtains on north and west-facing windows during the day significantly reduces solar gain. Additionally, ensuring that doors and windows are properly sealed prevents cool air from escaping, allowing the air conditioner to maintain the set temperature with less effort.
Enhance Airflow with Ceiling Fans
Running a ceiling fan in conjunction with your air conditioner allows you to set the thermostat slightly higher while maintaining the same level of comfort. The airflow created by the fan assists in moving cool air more effectively throughout the room, reducing the duration the aircon compressor needs to remain active.
Zone Your Cooling and Use Smart Controls
For households with ducted systems, zoning is an effective way to manage energy by only cooling the rooms currently in use. Rather than climate-controlling the entire house, focus on high-traffic areas during the day and bedrooms at night to avoid cooling empty spaces.
Incorporating smart controls or programmable timers also assists in maintaining the best aircon temperature without manual oversight. These tools allow you to schedule the unit to activate shortly before you arrive home or to shut off automatically once the outdoor temperature drops, ensuring the system only runs when necessary. Using a custom app to monitor and adjust settings remotely provides an extra layer of control, helping to prevent accidental energy waste when you are away from the property.
Maintain Equipment for Peak Performance
Regular maintenance, such as cleaning or replacing filters every few months, ensures the system operates at its rated efficiency. A clogged filter restricts airflow and forces the unit to work harder, which increases power consumption and shortens the lifespan of the internal components.
Optimise Electricity Usage with Portable Power Stations
While maintaining the best aircon temperature helps manage daily costs, integrating a portable power station into your home setup offers a strategic way to offset peak electricity prices. By charging these units during off-peak hours or via solar panels, you can power fans and smaller cooling devices during the most expensive parts of the day, reducing the overall pressure on your energy bill.
For targeted cooling and essential devices: A compact power station is effective for running high-velocity fans and personal electronics in a specific area, such as a home office or bedroom. This allows you to maintain comfort in the room you are currently using without the need to lower the thermostat for the entire house.
The EcoFlow DELTA 2 Max Portable Power Station provides sufficient expandable capacity that is well-suited for supporting multiple appliances over longer periods. By using its high AC output to run cooling fans and secondary electronics, you can reduce your reliance on grid power during high-tariff periods.
For high-demand energy management: The EcoFlow DELTA Pro 3 Portable Power Station is designed to handle more substantial loads, making it a robust option for households with higher energy requirements. Its large capacity allows it to support more powerful cooling equipment alongside home essentials, providing a flexible way to manage electricity consumption throughout the day.
Conclusion
For most Australian homes, the best aircon temperature in summer is usually a starting point of 25 to 27°C, not the lowest number on the remote. That range often gives a better balance between comfort and power use, especially during long hot afternoons. The right setting can still shift from home to home, depending on room size, sun exposure, insulation, humidity, and whether you are cooling the house during the day or trying to sleep at night. In the end, the best result usually comes from steady cooling, not overcooling.
FAQs
Is 22 degrees cold in aircon?
In Australia, 22°C for an air conditioner is generally considered cool but comfortable for most indoor spaces. On a hot summer day, it’s lower than the recommended 25–27°C range for energy-efficient cooling, so the AC will work harder and electricity bills may rise. For bedrooms or short-term relief, 22°C can feel refreshing, but maintaining it all day can be costly and put strain on the system.
Should upstairs rooms have a different aircon setting?
Yes, they often should. Upstairs rooms usually hold more heat because warm air rises, and the roof can add extra heat during the day. That means the best aircon temperature upstairs may need to be slightly lower than the setting used downstairs, especially in the late afternoon. If only one room feels too warm, changing airflow or closing unused areas can work better than lowering the whole system.
Is it cheaper to leave the aircon running all day?
Not always. If nobody is home for long hours, cooling an empty house usually adds unnecessary cost. A timer, smart schedule, or a later start before you return is often the better option. The best aircon temperature also works best when it matches real use, not when the system runs all day without need. In very hot weather, a moderate setting before arrival can still help avoid a stuffy indoor buildup.