Experts say you can:
Unplug electronics and appliances when they are not in use. Even if they are plugged in but not "on," they can consume the energy equivalent to a 75-100 watt light bulb.
Large appliances consume a lot of energy! Adjust the temperature of your refrigerator between 37-42 degrees Fahrenheit and freezer between 0-5 degrees Fahrenheit. Also, make sure that the doors are working properly so cold air doesn't escape.
Also, maintain your heating and cooling system. Annual maintenance checks and regularly replacing your air filters ensure that your HVAC system runs at peak performance.
Do bigger loads of laundry at once. Use cold water when possible
You can find more information at abt.com/help/green-initiatives.