Decision support to choose renovation actions in order to reduce house energy consumption – An applied approach

Abstract This paper focuses on improving the thermal performances of a set of houses built around 1970 and aims to develop a method for decision support regarding the choice of renovation solutions. The approach goes through two steps based on a multicriteria analysis. The first step allows the owner to choose a work package that meets his expectations at best. The second step is to specify the selected works by providing more detailed technical solutions, like defining the type of insulation (glass wool, sheep wool, etc.). The solution assessment on the various criteria is performed according to models, expert values or rules set by the experts involved in the project. One of the major challenges of the decision tool is to enable a merging of the project stakeholder points of view, based on a deep interaction between experts and owners. The output is not limited to the prescription of a renovation solution but enriches the house owner reflection in order to guide her/him into the whole renovation process. The article presents the approach, the method and an application to a house.