1. Collect your utility bills. Separate electricity and fuel bills. Target the biggest bill for energy conservation remedies.
2. Crawl into your attic or crawlspace and inspect for insulation. Is there any? How much?
3. Insulate hot water pipes and ducts wherever they run through unheated areas.
4. Seal up the largest air leaks in your house—the ones that whistle on windy days, or feel drafty. The worst culprits are usually not windows and doors, but utility cut-throughs for pipes (“plumbing penetrations”), gaps around chimneys and recessed lights in insulated ceilings, and unfinished spaces behind cupboards and closets. Better yet, hire an energy auditor with a blower door to point out where the worst cracks are. All the little, invisible cracks and holes may add up to as much as an open window or door, without you ever knowing it!
5. Set your thermostat back (forward) when you can accept cooler (warmer) conditions. This generally includes night time and whenever you leave your home for several hours. Many people find it easier to use an ENERGY STAR programmable thermostat that will automatically adjust the thermostat based on your time-of-day instructions.
6. Schedule an energy audit for more expert advice on your home as a whole, or learn how to conduct your own by visiting the Home Energy Saver Web site. A directory of available energy audit services by state is available at RESNET.

Source: Make Charlotte Green