You can save money on your heating and cooling bills by simply resetting your thermostat when you are asleep or away from home. You can do this automatically without sacrificing comfort by installing a programmable thermostat.
According to the Department of Energy, you can save as much as 10% a year on heating and cooling by simply turning your thermostat back 7°–10°F for 8 hours a day from its normal setting.
In the summer, you can save energy by keeping your house warmer than normal when you are away, and setting the thermostat to 78°F only when you are at home and need cooling. Set your thermostat at as high a temperature as comfortably possible. The smaller the difference between the indoor and outdoor temperatures, the lower your overall cooling bill will be.
Please remember even though your thermostat may be set on the same degree setting, your system is having to work much harder to cool your home when temperatures outside are hotter. When it is very hot, your air conditioning may be running constantly to generate and circulate cool air thorough the home.
Avoid setting your thermostat at a colder setting than normal when you turn on your air conditioner. It will not cool your home any faster and could result in excessive cooling and, therefore, unnecessary expense.