Get yourself into the habit of being mindful of what your thermostat is set to. You could make a huge difference by simply setting your thermostat at just 1°C above where it would normally be. Can you tell the difference between a room set at 23°C and a room set at 24°C? You may not think so, but A/C power consumption is raised by every degree above that of the room temperature.
Take the challenge today and see what a difference it can make!