Human factors play a key role on the improvement of energy efficiency at the workplace. Hence, they should be taken into account. Literature on Human-Computer Interaction (HCI) has demonstrated that ‘one-size-fits-all’ solutions fail addressing the user diversity in office environments. Therefore, this paper exposes how User Centered Design (UCD) and User Experience (UX) can act as pivotal tools to enhance user engagement i n digital interfaces that promote sustainable behaviour at work. To accomplish this goal, a digital interface that offers a range of strategies and functions directed to different user archetypes has been designed and evaluated both quantitatively and qualitatively. Analysed data revealed the importance of the UX to design positive interac tions which is a predictor of future system usage and engagement. The diversity of users and the impact of UCD on the Design for Sustainable Behaviour are discussed. Besides, future iterations of the design of a digital system that adapts dynamically to us er profiles are proposed.