Avoid placing devices that generate heat, such as televisions and lamps, near your air conditioning thermostat.
The heat may affect the accuracy of the thermostat and your air conditioning will continue to operate despite the room being cool.

Ensure that your roof space is adequately ventilated.
Temperatures in your roof space can be over 50˚ good ventilation will ensure reduce heat transfer to the rooms.

Locate the outdoor air conditioner unit on the shady side of the home,
ensuring there is adequate ventilation.