This is an accompanying data folder for the paper entitled " District heating with complexity: Anticipating unintended consequences in the transition towards a climate-neutral city in the Netherlands". This data folder includes the data collection and analysis methods that we have used in our research. Urban heating systems operate in densely populated areas, which gives rise to all kinds of socio-technical interdependencies. Such interdependencies influence pathways towards reaching carbon-neutrality goals, and result in policy resistance. Understanding these influences supports researchers and decision-makers to recognize systemic patterns that affect changes in urban energy systems, for example in terms of policy resistance, bottlenecks and delays during urban transitions. This research investigates the lessons learned from a project conducted in Rotterdam: a high-density city in the Netherlands which is in a unique situation as it is already switching from natural gas to district heating. We use ...