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Discover why ground-source heat pumps 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. Then go a step further and learn the simple science behind this proven technology. - Geothermal options: open vs. closed loops, either horizontal or vertical, for water-to-air or water-to-water HVAC systems. - Basic principles of heat pumps and how super-efficiencies are achieved. - Important money questions: costs, tax credits, payback time, increased home...