Energy Efficiency and Conservation of Late Twentieth-Century Architecture addresses a crucial issue for recent architectural heritage: how to improve its energy performance without compromising its distinctive characteristics and cultural significance. The volume, resulting from the EeTAC research project developed by the University of Genoa in collaboration with DOCOMOMO International, examines this challenge through interdisciplinary contributions and the critical analysis of thirty case studies. Attention is devoted to the building envelope, an architectural component in which energy-performance requirements and conservation needs directly intersect. The case studies are complemented by interdisciplinary essays that broaden the reflection on the conservation of modern heritage. The volume provides a critical basis for understanding and interpreting implemented interventions and for contributing to the still-open debate on conservation approaches and the ex-post evaluation of energy-efficiency interventions in late twentieth-century architecture.