To keep your home cool in summer close windows and doors, and pull down blinds or close curtains if you have the sun streaming in, that way it helps to keep you and your house cool rather than using an air conditioner.
If you’re at home on your own, close off the area you’re cooling so your air conditioning isn’t working to cool down rooms you’re not using.
Close the bathroom door if someone’s having a shower, and leave it closed (with the window open) while the room cools down again afterwards. Bathrooms don’t just get hot, they get humid too – which is hard for your air conditioning to deal with.
Remember that good quality insulation doesn’t just keep your home warmer during the winter; it keeps it cooler during the summer, too. If you haven’t already, consider insulating at least the floor and ceiling of your home.
Encourage cool air flow, open east facing windows in the evening and higher windows on the opposite side of the home to allow cross flow ventilation.