It is located on the Oregon beach and provides more energy that it consumes. That is possible because of 5kWh rooftop photovoltaic system and 12-inch-thick concrete walls. There are also solar-thermal tubes that provide hot water and a ground-source heat pump that warms and cools the air. The house is L-shaped and wrapped around Sitka spruce that’s 38 inches in diameter. Recycled materials were used during construction and the house is designed to last multiply generations. It perfectly blends into the forested hillside thanks to its sedum-sprouting green roof. One side of the house has views of Haystack Rock while the other views of the beach. A lot of windows provide the house with plenty of the natural light.. resource from