Saving energy > Heating

To save energy, set your thermostat as low as is comfortable in the winter and as high as is comfortable in the summer.
You save 3 percent on the day’s heating or cooling costs by setting your thermostat back one degree (higher for cooling, lower for heating) for that 24-hour period.
Use kitchen, bath, and other ventilating fans wisely. In just one hour, these fans can pull out a houseful of warmed or cooled air.
Turn fans off as soon as they have done the job.
Bleed trapped air from hot-water radiators once or twice a season. If in doubt about how to perform this task, call a professional.
Clean air registers, baseboard heaters, and radiators as needed. Make sure they're not blocked by furniture, carpeting, or curtains.
Make sure curtains don't block registers and air returns.
Install individual room controls to heat and cool rooms only when you use them.
Leaving heating or cooling running when no-one is home generates more greenhouse gas and costs more money. Timer controls can switch equipment on when it’s needed.
Have your heating and cooling systems serviced once a year to ensure peak operational efficiency.