Cooling choices depend on the building, equipment, weather and household. One trick cannot establish savings for every home.
Manage heat entry
Use suitable shade and blinds, and ventilate when outside air is cooler and safe. Draught control should not block required ventilation. Insulation performance depends on correct design and installation.
Maintain the system
Follow manufacturer servicing guidance and use qualified people for regulated work. Compare equipment costs, actual use and energy tariffs before replacing appliances. Fans can improve comfort for people but do not refrigerate a room. In extreme heat, follow health guidance rather than relying only on savings measures.
