This paper investigates new financing solutions to facilitate energy transition in the real estate renovation sector. Recognizing financing as a significant barrier to energy efficient renovations, the study aims to understand the role of investors and to develop innovative financial products. Our approach involved conducting detailed interviews with key financial sector stakeholders, including banks, pension funds, and fund managers, to gage their perspectives on current challenges and to explore novel financing hypotheses. This was achieved through the co-design methodology. The findings indicate that while mortgages remain the prevalent financing method for renovations, there is a pressing need for more tailored financial products that can address issues related to insufficient equity and borrowing capacity. The research underscores the potential of a hybrid financial product that combines features of Energy Performance Contracting, leasing, crowdfunding, and secured financing, providing a more flexible and accessible financing avenue for energy renovations. This new financial model needs field testing to confirm its effectiveness and suitability within the Swiss energy renovation context.