Keep blinds and curtains closed. Curtains and blinds serve as a great insulator, thus reduce the heat in the room for day. Which equal to reduce use of air-conditioning.
Change the filters in air conditioners and furnaces. Not only does it keep systems running at optimum efficiency, it keeps the air in your home cleaner too.
Place window air conditioners on the shadiest side of the house. It won't have to work as hard and will use less power.
Ensure air conditioners and furnaces are the right size. Too small, it has to work too hard. Too large and they lose their efficiency, therefore using even more electricity. Nowadays energy saving air-cons are available to aid reducing your electric bill. But remember to off it when not in use.
Off appliances and electronic device. Keeping these items on tend to little electric, so remember to turn off when not in use.
Use energy saving bulbs. Although they cost a little more than regular bulbs, they last up to 10 times longer and use a lot less electricity.
Water heater. This is a high electric consuming item, keeping it on always is equal to having to power another fridge in your house. So do keep the water heater off to save some bucks monthly.
Always keep the fridge door closed. If you keep the fridge door open for too long, then cold air will escaped, thus causing more electric to use to generate cool air inside it again. Keep opening and closing also caused more electric use. So do pack your fridge neatly in order to take what you need.
Set timer for air-cons. Everyone are so used to having air-condition on throughout the night, but you can set timer to off the air con in the middle of the night or towards morning, since the room is already cool.
Choose fan as an alternative. Fan uses less electricity, if the weather is cooling, opt for fan as an alternative to air-cons.