In any case, never preheat for more than 10 minutes. Whenever you can, use the range top instead of the oven. The range uses far less energy. When cooking or baking in your oven, do not open the oven door any more than absolutely necessary. If you do not already have one, consider purchasing a microwave oven.
Microwave cooking uses much less energy than conventional cooking.
Hot Water Conservation Take showers instead of baths. Install low-flow showerheads. Don t let faucets drip. Just one drip a second from a leaky faucet can waste up to 200 gallons of water a month. Replace worn out washers.