Harvard's HouseZero

Researchers at the Harvard Center for Green Buildings and Cities have completed a retrofit of a 1924 home that makes it a "zero emission" energy-efficient building. HouseZero employs both solar and geothermal energy, but the amazing part is all the computerized parts that make the house fend for itself. Sensors through the building compute what systems to employ, and the windows open and close themselves. That in itself will make you fear the repair costs when one thing stops working. Natural ventilation will save you tons of money on air conditioning, but here in the humid South, you may also have to contend with mold on your organic furnishings: wood, leather, and cotton. Don't ask me how I know. (via Digg)