Geothermal vs. Ground Water vs. Water Furnace
Geothermal energy has been used to heat and air condition buildings for several decades, and, during that time, these geothermal systems have been called many different things. Some of the more popular variations include geo-thermal, geoexchange, ground-water, ground-water assisted, ground-water-source, water-to-water, and even our company name, water furnace heating and cooling.

All of these terms, though, convey the same thought: use of geothermal heat pump technology to tap the energy in the earth's surface and drive a heating and air conditioning system for both residential and commercial uses. The result is a green or natural heat pump that saves energy and benefits the environment.

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http://waterfurnace.com/residential.aspx

Tax credits:

http://www.waterfurnace.com/tax_credits.aspx