• Set your thermostat comfortably low in the winter and comfortably high in the summer. Install a programmable thermostat that is compatible with your heating and cooling system.
• Use compact fluorescent light bulbs.
• Air dry dishes instead of using your dishwasher's drying cycle.
• Turn off your computer and monitor when not in use.
• Plug home electronics, such as TVs and DVD players, into power strips; turn the power strips off when the equipment is not in use (TVs and DVDs in standby mode still use several watts of power).
• Lower the thermostat on your hot water heater to 120 degrees Fahrenheit.
• Take short showers instead of baths.
• Wash only full loads of dishes and clothes.
• Drive sensibly. Aggressive driving (speeding, rapid acceleration and braking) wastes gasoline.
• Look for the ENERGY STAR® label on home appliances and products. ENERGY STAR® products meet strict efficiency guidelines set by the U.S. Environmental Protection Agency and the U.S. Department of Energy.

Source: U.S. Department Of Energy | Printable Version