In the first semester the simulator was only loosely incorporated into the course. Ordinary classroom instruction was followed by a survey on heat transfer concepts. Then, the students were instructed to answer various assigned conceptual heat transfer questions by using the simulation. This was followed by a second survey to determine the impact of this self-study activity on their understanding. In the second semester the self-study activity was replaced by an in-class active learning activity using the simulation. The students were again surveyed before and after the simulation activity to determine its impact on their conduction heat transfer understanding.