A prevailing perception within the research field of energy and buildings is that buildings – and not people – consume energy. Researchers and practitioners often neglect the important effect of the actual behaviour of people living or working in buildings, together with the values, habits, motivation factors, and other practices connected to the energy use. The key aim of this paper is to demonstrate the added value of the ethnographic approaches and interdisciplinary analysis for understanding and influencing human behaviour to support and enhance deep energy renovation of residential buildings. It presents the methodology together with preliminary findings from a demonstration study in Slovenia. It concludes by providing case-specific recommendations in terms of affordability, acceptability and attractiveness by considering everyday lifestyles, motivations, and issues faced by actors involved in the renovation processes.