How do I use air conditioning efficiently? Is it better to blast it briefly throughout the day, or just leave it on?
Many people think they can save money and energy by just blasting the air conditioning at a very low temperature, such as 17°C, for a short period of time to chill the room – before switching it off and enjoying the chilled air until another blast is needed later on. But it requires a lot of energy to get a room to a very chilly temperature.
Source: architectureanddesign.com.au