Firstly, you should aim to prevent your home from gaining heat during the day by closing curtains and blinds. Heat absorption can be drastically reduced by having tinted windows to stop the suns heat. This will decrease the workload on your aircon when it is turned on.
Secondly, you won’t be getting the most out of your air-conditioning if your let all that cool air get away. Keep cold air in by closing curtains, blinds and doors to only cool the rooms you are using. Therefore, your aircon unit won’t have to work so hard, keeping your aircon costs to a minimum.
Switching off household appliance that emit loads of heat. For example, the television, computer, printer and lights should be switched off if they aren’t being used. Additionally, reducing oven use by opting for a cooler meal or cooking outside on the BBQ could be another way to reduce the house’s temperature.