Review of modern demand control solutions and technologies for HVAC operation Anatolijs Borodinecs, Jurgis Zemitis, Arturs Palcikovskis, Arturs Ardavs and Egons Lavendelis E3S Web of Conf., 396 (2023) 02020 Published online: 16 June 2023 DOI: 10.1051/e3sconf/202339602020