For more than 20 years the French duo Anne Lacaton and Jean-Philippe Vassal have pursued a unique approach to housing that integrates outdoor areas modelled on the winter garden. Their projects are open to the climate, transparent, and permeable, designed to work with rather than against climate. This book is the first scientific study of the thermal performance of winter gardens in residential constructions, showing their potential and effectiveness via selected projects of Lacaton&Vassal: from their first house, Latapie, to a recently completed apartment and office tower in Geneva.