A guide for every season
When the temperatures waver between a typical Aussie summer and the sweet relief of a cool winter, it can sometimes be a little hard to know when or how to adjust your air con to adapt to actual local conditions.
For most Brisbane homes, the best air conditioning temperature is typically between 24-26°C in summer and 18-20°C in winter. But the answer isn’t the same for every household – and sometimes it can even be a little more complicated to set an ideal temperature that hits the exact sweet spot between comfort and the savings that come from optimal energy efficiency.
Let’s take a closer look at what we think are the best AC temperatures for everyday Australian homes, along with some practical tips to help you keep comfortable while keeping energy costs under control.
What’s the most optimal air conditioner temperature in summer?
First off, we should say that a term like “optimal air con temperature” usually refers to the setting that provides the best balance between your own comfort and the energy efficiency of your system.
With that fact in mind, our recommended air conditioning temperature for most Australian homes sits at between 24°C and 26°C when cooling during warmer summer months – which helps reduce energy consumption and keeps your electricity bills more manageable, while also avoiding putting strain on the system during long periods of hot weather.
That range helps maintain a comfortable indoor climate without placing any unnecessary strain on your air con system. And while a lot of people might assume that lower, colder settings will cool a home a whole lot faster, air conditioners don’t work that way: setting the system to 18°C instead of 24°C won’t actually speed up the cooling process; it’ll only make the unit run longer and use more electricity.
Tips on staying cool efficiently
Use ceiling fans alongside your air conditioner to circulate cool air more effectively
✓ Close blinds or curtains during the hottest part of the day to reduce heat entering the home
✓ Keep doors and windows closed while the system is running
✓ Avoid setting the thermostat below 22°C unless necessary
✓ Make use of zoning features (if your system supports them)
What’s the most optimal air conditioner temperature in winter?
For winter, the best heating temperature is between 18°C and 20°C. Heating your home above this range can too quickly increase electricity costs and often creates rooms that feel stuffy or overly dry. But a more moderate setting will do a lot to provide enough warmth for comfort while at the same time letting your system run efficiently.
Tips for saving energy in winter
✓ Close doors to unused rooms to avoid heating unnecessary spaces
✓ Seal gaps around windows and doors to cut down on heat loss
✓ Use timers to warm rooms only when needed
✓ Clean air filters regularly to maintain airflow and efficiency
What’s the most optimal air conditioner temperature while sleeping?
Your sleep quality can be heavily influenced by room temperature. That means that, for most people, the ideal sleeping temperature sits between 18°C and 22°C so you can get a good night’s rest in a climate that’s not too warm or too cold. Plus, a slightly cooler room than you might use during the day helps the body naturally lower its core temperature, which also helps support a deeper and more consistent sleep.
Tips for night-time air con
✓ Use sleep mode or set a timer so the unit doesn’t run all night unnecessarily
✓ Combine cooling with a fan for gentler airflow
✓ Avoid very low overnight temperatures that will become too cold when waking up the next morning
How to find the perfect temperature for your home
Keep in mind, though, that there’s no single, universal temperature that works perfectly for every household. Different factors will influence how warm or cool your home feels, which means they can help you understand your home cooling needs a little better and help you stay on top of it.
- Room size – larger rooms will usually take longer to cool or heat evenly, especially if the system itself is undersized.
- Insulation – well-insulated homes retain conditioned air more effectively, helping to maintain a stable indoor temperature with less energy use.
- Ceiling height – high ceilings can affect how air circulates throughout a room, especially during winter heating.
- The number of occupants – more people in a room at one time generate additional body heat, which can actually make the space feel warmer.
- Sun exposure – rooms that receive direct sunlight will naturally be in need of more cooling during summer.
Other smart thermostat tips
✓ Use programmable schedules that match your daily routine
✓ Avoid frequent manual adjustments throughout the day
✓ Take advantage of zoning features if possible
✓ Monitor energy usage patterns during extreme weather periods
A few temperature mistakes it’s best to avoid
Setting the temperature too low
Very low settings in summer don’t actually cool the home faster – they simply force the system to operate longer and consume more electricity. Plus, in Brisbane, where humidity levels can often be extremely high, setting the temperature too low can also increase the risk of condensation issues forming around vents and surfaces. It’s better to set your air con at a more normal temperature and wait for the air to change naturally.
Constantly changing the temperature
Don’t go crazy on the buttons, because frequent adjustments to raise or lower the AC temperature can make it harder for the system to maintain a stable atmosphere as efficiently as it can.
Leaving the air cond running unnecessarily
Running the system in empty rooms or overnight without timers can waste significant energy over time.
Forgetting to clean and service
Regular servicing always plays an important role in maintaining performance. Dirty filters, blocked airflow, and poorly maintained systems often struggle to reach the desired temperature efficiently.
Quick guide: recommended AC temperature settings
- Summer: 24-26°C
- Winter: 18-20°C
- Sleeping: 18-22°C
