This paper summarizes the results of an educational experience focused on the conceptual design of an eco-feedback system for a University Campus. The students participating to the study worked on the proposals of personal and public interfaces that were developed at the conceptual phase, starting from a set of compulsory and optional requirements. This work gives a summary about which were the requirements that were perceived as more important by the students and which were the most frequent proposals of interfaces and locations chosen for the deployment of them. The results of this work can represent a valuable guide for the design and deployment of eco-feedback interfaces in a public context.