Bruce Pfeffer and Amy Beth Kressel are self-described environmentalists who have made energy- efficient improvements to their Indianapolis home over the past five years.
After the married couple had a home energy audit, they added insulation, replaced their heating and cooling system with a high-efficiency furnace and heat pump, caulked drafty windows and switched to lower-wattage light bulbs.
Despite their efforts, the couple still wanted to do more. They went big, adding 32 solar panels last August to their roof. The photovoltaic solar system converts sunlight directly into electricity.