Hue-Heat Hypothesis: A Step forward for a Holistic Approach to IEQ Francesca Romana d’Ambrosio Alfano, Laura Bellia, Francesca Fragliasso, Boris Igor Palella and Giuseppe Riccio E3S Web Conf., 111 (2019) 02038 Published online: 13 August 2019 DOI: 10.1051/e3sconf/201911102038