• Introduction
• Conservation options
• Passive solar heating
• Active solar systems
• Photovoltaics (solar electricity)
• Geothermal energy
• Remodeling brochure
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Geothermal Energy

Geothermal or ground source heat pumps take stored solar energy from the soil and bodies of water. They rely on electricity but provide the equivalent of three times the kilowatt heat for every kilowatt delivered. Heat pumps are reversible, supplying cooling and heating, so they can be useful in areas with significant cooling loads.