A straight-talking book on why ground-source heat pumps (GHPs) are the best choice for heating and cooling new or existing homes in any climate and how this reliable, silent, non-polluting way of extracting free energy from the earth saves money year after year. Ideal for homeowners, anyone training for the geothermal industry, and home-building partners (architects, builders, lenders, inspectors), Geo Power explains the various GHP system options and why installing a geothermal system is a smart investment. Then author Don Lloyd goes one step further and provides insights into the simple science of this proven heat-pump technology. - Geothermal system options: open loop vs. closed earth loops; either horizontal or vertical, for water-to-water or water-to-air HVAC systems. - Important money concerns: costs, tax credits, payback time, increased home values. - Earth Smart Home profiles from around the country. - Incorporating solar electricity. - Understanding the basic principles of heat pumps and how super-efficiencies are achieved. - Performance standards, ratings, and warranties. - Careers: joining the industry. - Extensive appendix.