Geothermal and Geoexchange systems are certainly among the most sensible, cost effective forms of renewable energy for buildings. Also known as ground-source heat pumps they may not have the pizazz of a solar panel, and they're not a visible badge either, but they are reliable and predictable, which neither Sunlight or the Wind can claim.
I caught this video here on CleanTechnica.com. It's a great outline if you know nothing about these systems.
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