One of the most pressing issues of climate policy is how to get building owners to invest in the energy efficiency of their homes. The German federal government has set the goal of decreasing the energy demand of buildings by 80 to 95 percent until 2050. One pillar of the strategy to support building owners in this task is the provision of targeted energy advice, to both motivate owners to implement an energy efficiency refurbishment and help them to choose the most efficient measures. In this paper we analysed the demand for energy advice in three German cities of the Ruhr area finding the number of energy consulting provided to be extremely low compared to the stated goals. Based on the approach of joint knowledge production we invited stakeholders from the three cities to participate in a series of workshops in order to develop ideas how to more effectively bring homeowners and energy advisors together. As a result, different energy advice experiments were co-operatively developed for each city targeting different groups by using tailored channels for outreach. The evaluation of both the process as well as the outcome of the experiments indicates that while joint knowledge production is a suitable approach to enable knowledge transfer and formation of new networks between different stakeholders in science and practice, it does not necessarily lead to superior approaches with regard to effectively addressing a policy issue at hand. Apart from the experiment in which the window of opportunity change of building ownership was taken advantage of, participation of target groups in the experiments has been soberingly low, underlining the value of so-called trigger points when designing effective outreach strategies to building owners.
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