Around 1800, one of the most influential architectural concepts of the last 250 years emerged - that of built spaces as technical devices. Climate, morality, and comfort are the three main themes of this study, and each is vividly examined in separate chapters through synchronous comparison and with the help of examples. The emergence of corresponding metaphors, knowledge, and construction forms is traced over a period of about 70 years. The author focuses particularly on the operative dimension of architecture. Thus, the book provides a historical perspective on a key topic for the future of architecture. The book is aimed at readers interested in architecture, technology or the cultural history of building and living.