Increase the efficiency of your heating and cooling systems by cleaning air filters regularly, adding insulation in the attic and basement, and sealing air leaks and air ducts. Unplug power cords when not in use and use a power strip to turn off computers, printers and other electronics. Buy Energy Star lightbulbs, appliances, windows, heating and cooling equipment, and electronics. The U.S. Environmental Protection Agency places the Energy Star Label on products that meet energy efficiency requirements based on EPA specifications.