While the technology has existed since the late 1940s, geothermal heat pumps, also known as ground-source heat pumps and GeoExchange®, currently account for less than two percent of the total North American heating and cooling market. With support from the United States Department of Energy Geothermal Technologies Program through the American Recovery and Reinvestment Act of 2009, Bob Lawrence & Associates, Inc. and the California Geothermal Energy Collaborative will gather and analyze manufacturing and installation costs and geological and geographic data to assess the costs and economic, environmental, and social benefits resulting from three varying scenarios of nationwide geothermal heat pump deployment