ShutterBug would like to provide important energy efficiency information, or Energy Savers, from the U.S. Department of Energy.
Window Shades - when properly installed, window shades can be one of the simplest and most effective window treatments for saving energy. Pleated or Cellular Shades offer greater efficiency and manufacturers have designed two- or three-cell pleated or cellular shades with dead air spaces, which increase their insulating value.
Window Blinds - blinds are offered in both vertical and horizontal slat-type and are more efficient at reducing summer heat gain. Unlike shades, with blinds, you can adjust the slats to control light and ventilation.
The most important thing to remember is that your windows must be covered to control the amount of heat or cold that enters your home. Don't overwork your cooling/heating system and pay more than you should for electricity. Choose a cost effective window covering for your home to save money and create a great new look for your home!