If you are looking to cut back on your heating and cooling spending, geothermal heat pumps can lower those costs by up to 70 percent.  It even costs less to keeping the thing running.  A geothermal heat pump pulls in its necessary energy from the ground, making it a renewable resource.  Regardless of the weather raging outside your home, you only have to go a few feet underground to find an almost constant temperature of 50 degrees for the heat pump to tap into.