Close off rooms you don't use - and remember to shut the vents inside.
Use compact fluorescent lights. They last up to 10-13 times longer than standard bulbs and use 75 percent less energy.
Install dimmer switches. In addition to enhancing the mood, they'll extend the life of your bulbs and help you save up to 60 percent on your lighting costs.
Install motion activated switches that automatically turn lights on and off.
Lower the temperature of your water heater from 140 to 120 degrees. You'll save 3 percent-5 percent in water heating costs for each 10 degree reduction. Or consider a timer to turn your water heater off when not in use.
Install water-conserving fixtures, such as showerheads, faucets and toilets.
Fix leaky faucets, especially hot water faucets. One drop per second can add up to 165 gallons per month - more than a person uses in two weeks.
Take showers instead of baths. A five-minute shower will use about 7.5 gallons of hot water; filling a bathtub can use up to 20 gallons.
Install ceiling fans. They could cut your energy bill by 40 percent.
Don't keep your refrigerator or freezer too cold. Recommended temperatures are 37 to 40 degrees F for the refrigerator and 5 degrees F for the freezer.
Don't leave the fridge door open! Every time you do, up to 30 percent of the air inside can escape. The same can be said for your oven.
Use less water and use cooler water when doing laundry. The warm or cold water setting on your machine will generally do a good job of cleaning your clothes. Switching your temperature setting from hot to warm can cut a load's energy use in half.
Consider air-drying clothes on clothes lines or drying racks. Air-drying is recommended by clothing manufacturers for some fabrics.
Use a covered kettle or pan to boil water; it's faster and it uses less energy.