The Passive House (”Passivhaus”) concept is a rigorous, voluntary energy performance standard for buildings that reduces heating requirements by up to 90% and overall energy use by up to 80% over standard construction. Developed in Germany in the early 1990s and drawing on Super-insulated and Passive Solar ideas from North America and “Low Energy” European building standards, the concept of a building that could be practically constructed to maintain a comfortable interior climate without conventional heating or cooling systems was devised, tested and proven. The Passive House remains comfortable without large "active" mechanical systems, hence the term "Passive." Dr. Feist, the originator of the Passive House Standard, will outline the theory and measured results based on 20 years of high-performance building design, construction and research.