Nothing will ever be truly zero cost, but those costs can be minimal. A geothermal system for your house involves "transporting energy to your home" but the di

Nothing will ever be truly zero cost, but those costs can be minimal. A geothermal system for your house involves "transporting energy to your home" but the distances involved are so minimal that once installed it's next to nothing. > Since placing your home next to a large temperature differential is difficult... Well, that's wrong. Every house sits on top of a significant temperature differential which is why geothermal systems work. In large parts of the continental US the ground deep beneath the house maintains a consistent temperature year round. This can be used as a thermal sink in the summer, and a source of heat in the winter.