• Air-dry dishes instead of using the dishwasher's drying cycle
• Turn off computer and monitor when they are not in use for extended periods of time
• Plug home electronics into power strips and turn power strips off when not in use
• Lower thermostat on hot water heater to 120°F
• Wash only full loads of dishes and clothes
• Clean/replace AC filters monthly; cleaning or replacing dirty air filters can save 5% of the energy used to run the AC system
• Close the air vent in the laundry room
• Replace incandescent light bulbs with compact fluorescent bulbs
• Caulk or weather-strip air leaks.
• Repair leaky air ducts: these are recognized as a major source of energy waste and can prevent heating, ventilation and air conditioning (HVAC) systems from working properly (request a duct system test from your home's energy provider).
• Close blinds and shades during the day to keep out the sun's heat

http://livinggreen.ifas.ufl.edu/energy/index.html