Yannis Merlet is a research engineer at CSTB since September 2022, specializing in thermal evaluation and simulation of buildings, focusing on R&D of new methods for thermal comfort. Prior experience includes serving as a postdoc at CEA from October 2020 to September 2022, where Yannis worked on multiobjective optimization for district heating networks, including a significant project to reduce supply temperature. Yannis also completed a PhD at LOCIE (September 2016 - July 2020) focusing on optimizing building retrofitting strategies as part of the Reha-parcs project. Previous positions include HVAC engineer at EKIUM, where Yannis undertook system design and project supervision, and intern roles at ValSolar and Eiffel Industrie, focusing on energy efficiency and project management. Yannis holds a PhD in building physics from Université Savoie Mont Blanc and a Master of Engineering in Energy and Propulsion from Institut national des Sciences appliquées de Rouen, along with international studies in power engineering.