The Report, led by COMMONSPACE and co-led by ULAB, presents the comprehensive mapping of urban heat vulnerability in Turin and Halandri, by combining socio-economic aspects with structural and environmental features of the urban context related to climate. This Report is a key milestone within MAINCODE Work Package 3 and it aims to identify highly heat-sensitive areas within the two cities that serve as the priority zones for climate adaptation interventions and, specifically, for the development of Urban Climate Shelters (UCS). By integrating social, spatial, environmental, and climatic data, the vulnerability mapping provides evidence-based guidance for selecting the schools of UCS co-design and pilot implementation.