Physicists Bo Adamson from Lund University in Sweden and Wolfgang Feist from the Institut für Wohnen und Umwelt in Germany had read the research, dating back to the 1970s, that suggested it was possible to construct a low-energy building that was designed to exploit passive solar technologies and establish a comfortable indoor temperature with a low-energy requirement for heating or cooling. In 1988 the two professors coined a German term to describe this process. It was “Passivhaus.”