The ideal temperature for an air conditioner in summer is between 24 and 26 °C (75 to 79 °F). Setting it lower does not cool the room faster. It just runs the unit longer and pushes the electricity bill up for no extra benefit.
Why Setting It Too Low Backfires
The common assumption is that a lower set point means faster cooling. In practice, that is not how it works. An air conditioner cools at a fixed capacity regardless of what the display reads. What changes is how long the unit runs and how much electricity it uses. Setting the thermostat to 18 °C makes the unit run much longer, consumes significantly more energy, and does not bring the room to a comfortable temperature any faster.
The Recommended Temperature Range
Between 24 and 26 °C, most people feel comfortable in summer without the unit working at full capacity the whole time. This range also keeps the temperature difference between indoors and outdoors at a manageable level, which is easier on the body when moving in and out. The unit can modulate output smoothly rather than hammering away at maximum.
Other Steps That Cut Energy Use
- Avoid frequent switching on and off. The power surge at startup is much higher than steady running. Leave the unit on rather than cycling it constantly.
- Keep doors and windows closed. Every opening lets warm air in and raises the cooling load immediately.
- Use blinds and curtains. Blocking direct sunlight is the single most effective way to reduce heat gain before the air conditioner even has to respond.
- Use eco or sleep mode. Where available, these modes automatically reduce output to match actual demand rather than running flat out.
At Night: Use Sleep Mode
In the bedroom, sleep mode gradually raises the set temperature by one to two degrees once you have been asleep for a while. This protects you from the discomfort and disrupted sleep that come from a very cold room, and cuts consumption during the hours when you feel heat least.
The Bottom Line
Getting the temperature right is not about giving up comfort. It is the most efficient path to staying cool. At 24 to 26 °C with the habits above, you get the same result and pay less for it. Browse our range of air conditioners for every room size.