The majority of your home's energy bill each month is due to heating and cooling your home. You can do a lot to reduce these costs by doing a few simple things. Set your thermostat 1-2 degrees higher or lower depending on if your are heating or cooling. You will not notice much of a difference in temperature, but your utility bill will. Make sure you regularly change your air filter, as clogged filters can overload your system, causing it to work harder. Update your old Mercury bulb thermostat to a new digital one that can program itself throughout the day.