Install a programmable thermostat
Why heat your home when you're not there? You can save around 5 - 10% a year on your heating bill by simply turning your thermostat back 10-15 degrees for just eight hours a day, either while you are asleep or are away from home. This can be done automatically without sacrificing comfort by installing an automatic setback or programmable thermostat.
Programmable thermostats come with a variety of energy-saving features, most are easy to install and they are readily available at your local hardware or building supply stores.