Urban Abacus of Building Energy Performances: a methodological approach Stefano Pili, Valeria Fois, Eusebio Loria, Caterina Frau and Pier Francesco Orrù E3S Web Conf., 197 (2020) 02014 Published online: 22 October 2020 DOI: 10.1051/e3sconf/202019702014