More than 1 million U.S. households now warm their homes in the winter with heat from the earth instead of using furnaces or fuel lines. Elton John, Virgin Airlines chief Richard Branson and Microsoft co-founder Paul Allen use ground-source energy in their homes.
Even George W. Bush has a geothermal system in his vacation home in Crawford, Texas. Designed by architect David Heymann, Prairie Chapel Ranch captures solar energy and has a cistern that gathers rainwater and wastewater, purifies it and then uses it to irrigate the greenery around the presidential vacation home.
