Solar furnace

This room is used to collect solar energy in the form of heat and to vent it into the building. The wall on the left is created entirely using Kallwall, a building material that allows in light and diffuses it yet is highly insulating. The building uses Kalwall in many places to take advantage of natural light. Here Kalwall allows for sunlight to come in and heat the room and a vent on the right brings the heat into the adjacent room. Last winter, the outside temperature was 20 degrees below, but this "solar furnace" room provided enough heat for the workshop next door.