Lower your thermostat in winter by 2° F and save 353 lbs. of carbon dioxide per year. Change furnace filters often because dirty filters restrict airflow and waste energy. Keep your furnace clean and properly adjusted. Switch from an oil or electric heating system to natural gas, which is more efficient. Replace simple dial-type thermostats with smart programmable thermostats. These units allow you to set the heating and cooling system to take a break while you're asleep or out, then come on at preset times to keep you comfortable when you wake up or come home. In an average house this can reduce emissions by 1,000 pounds per year—not to mention producing significant savings on your energy bill, with a quick payback of the $50–100 cost. Dress warmly to stay comfortable without turning up the heat. Lower the thermostat to 55 degrees or off at night or when leaving the house/office for an extended period of time. For every degree you lower your heat in the 60-degree to 70-degree range, you'll save up to 5% on heating costs.
http://www.cwac.net/energy/energy_saving_tips.html
