This net-zero energy home features insulated concrete forms, structural insulated panels, high-performance windows, cementitious siding and a solar photovoltaic system sized to cover all the energy usage. The main space is oriented to the north, with windows on other faces carefully regulated. This allows a lot of even daylight in the house without bringing in direct sun. The structural walls are made of "SIPs" (Structural Insulated Panels) - pre-fabricated, highly-insulated wall panels with no studs (saving energy and wood). The south-facing roof has a 13.4 kW photovoltaic array (solar panels). The combination of passive solar orientation, tight building envelope, and innovative technology to provide heating, cooling, and domestic hot water via one system minimizes the amount of energy required to heat the house.