First and foremost, just using sound judgment will save you a lot of money. If the temperature cools down in the evening, turn your ac unit off and open windows. Letting the cool air in will work to cool your home in two ways. Thermal mass such as furniture, and the structure of your home itself, holds heat in and will release it into the air. Cooling the large structures by using the outdoor temperatures will decrease the time the ac unit needs to run and when it is on, comfortable temperature levels will be reached http://www.dayandnightair.com quickly.
Before the temperature begins to rise, and when the sun shines, closing the windows and covering them will keep the cool temperatures comfortable longer. Utilizing the ac unit only when the temperatures begin to rise inside the home will save money.
Making use of ceiling fans in each room used in your house will make the air feel cooler and decrease the need for lower temperatures to be obtained by the ac unit. Make sure that your fans are newer and low energy users. Close the ac unit vents in the rooms not used in your houses. If your dining room is hardly ever used, or you have spare bed rooms, close those vents. Only the rooms used everyday ought to be cooled.
Make sure your home is well insulated, as drafts are just as uneconomical in the summer as they are in the winter. Use insulated drapes, particularly on southern facing windows. Keep them closed throughout the day. These simple ideas will keep your home cooler and you will make use of less energy, equaling lower energy costs.