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The average national cost to install a geothermal heating or cooling system is $5,745, with most homeowners spending between $3,534 and $11,089.
The initial costs of geothermal energy are high -- wells can cost $1 to $4 million each to drill, and installation of a home geothermal pump system can run as much as $30,000 [sources: REPP, Consumer Energy Center ].owever, a home geothermal energy pump can cut energy bills by 30 to 40 percent and will pay for itself within 5 to 10 years [source: Consumer Energy Center ]. Geothermal energy is considered renewable because the heat is continually replaced.