Appraisal of thermal premium in green building practice at urban scale

States and international organizations are aware of Earth environmental emergency, as well as of urban ecological and energy crisis. One causal factor among several is the dis-investment of existing old settlements and the migration of a high percentage of rural population to metropolis. A dramatic consequence is the wild urbanization of all available rural agricultural land surrounding origi-nal built areas in large cities and the increase of urban congestion which causes, among others effects, artificial mobility, private cars over-use, energy over-con-sumption, air over-pollution. Communities and territories are addressed by leading organizations to treas-ure and re-use the consolidated old settlements, not to abandon them, and there-fore to save the open and arable land surrounding cities and metropolis, by means of: revitalization of economy in historic towns and old villages; physical rehabilitation following their economic revamping. For more dense settlements already existing “Green Urban Conservation” actions are introduced and ad-dressed such as: restoration and retrofitting interventions, characterized by both bio-ecological and cultural sustainability over the wide heritage; energy rehabili-tation of buildings for dramatic consumption reduction; adoption of renewable energy sources; diffusion of zero mile decentralized energy production (with notransport) aiming to make local communities energy independent and, as much as possible, self-sufficient.