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Dr. Lund is not only one of the nation's foremost geothermal experts, he uses it to power his home. "To heat my house, my hot water, my hot tub, everything, (for) ten dollars a month." Lund uses what's known as a geothermal exchange pump, buried several hundred feet below ground in his backyard for his home. Pumps are a localized system that uses the heat of the ground water, through an assemblage of pipes to bring up the extreme warmth of what's beneath the surface. They can be used anywhere in the world.