Washer:

• Use cold water when washing clothes
  The hot water cycle of most washing machines uses 90% more energy per load than the cold water cycle. Using the hot water cycle can also shorten the life of your clothes.
• Size does matter
  Make sure you set the load size for your laundry to the correct setting and only wash full loads of clothes. Don't waste water and electricity on a half-empty washing machine.

Dryer:

• Clean you dryer's lint filter with every load of laundry
  A clogged lint filter obstructs airflow and is a potential fire hazard. If you have to dry a load a second time, you use twice the energy and you double the cost.
• Check the exhaust
  An obstructed exhaust vent can considerably lengthen drying times and cost you money.
• Hang them up!
  Whenever possible, hang your clothes to dry. Why? The sun's energy is free.