On This Page • • • • • • • • • In the search for new energy resources, scientists have discovered ways to use the Earth itself as a valuable source of power. Geothermal power plants use the Earth's natural underground heat to provide clean, renewable energy. As far back as the 1800s, people extracted water from geothermal hot springs to use in homes or businesses. However, it wasn't until 1960 that the first large-scale geothermal electricity generation plant began operating in the United States, at The Geysers in California. Today, the United States has approximately 3,187 megawatts of installed geothermal generating capacity, more than any other country in the world. ![]() Nationally, the average cost to install a geothermal heating or cooling system is $7,378, with most homeowners spending between $3,483 and $12,654. With equipment and variable excavation costs, total prices can reach above $20,000 for residential types. Proponents of geothermal heating and cooling systems have been. Sales for fall 1997 through spring 1998. Most geothermal systems are installed in new. Geothermal HVAC systems (heating, ventilation, and air conditioning) are growing in popularity as homeowners seek ways to reduce their carbon footprints and lower monthly bills. These units are slowly becoming a popular choice as both improvements in technology and tax incentives drive lower prices for both purchase and installation. However, installation costs are still higher than air exchange, gas, or electric setups expect to spend about twice as much. Geothermal HVAC are the most energy efficient and cost-effective form of heating or cooling. On This Page: • • • • • • • • • • •. ![]() Horizontal, Vertical, and Pond Ground LoopingYoull typically need about 400-600 feet of looping per ton, or about 3 tons or 1500 feet for an average home. • Horizontal $800 per ton This type can be either slinky with overlapping coils or straight pipes. Slinky utilizes less land area but usually needs highly conductive soil. • Vertical $1,500 per ton Used when land area is insufficient. Instead of digging horizontal trenches, vertical types run a few hundred feet straight down into the earth. • Pond varies (about $800 per ton) it depends on the location of the pond. A trench alone will cost about $10-$20 per linear foot. The closer the pond is to your home, the less excavation needed. They are usually more efficient with thermal transfer but require a body of water at least 8 feet deep. Open LoopSpecific costs will vary greatly between these two types depending on your situation. The type best suited to your needs will depend heavily on available water sources, soil types, and land area. • Closed loop systems run water through a circular loop of piping, typically using an antifreeze liquid solution. This type is used when there are limited water sources, prohibitive environmental regulations, or with pond configurations.
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