Using a strong cooperative learning structure, an inquiry-based course Fire & Ice for non-science majors addresses the concepts of heat and temperature, as well as the historical development of these ideas. A coherent line of inquiry is developed based on the particulate nature of matter which guides students in constructing the concepts of kinetic molecular theory, absolute zero, thermal equilibrium, thermal conduction, energy conservation, and energy degradation. This is accomplished by interleaving hands-on explorations, question-based team discussions, data sharing, and whole class reviews. Student performance on an established thermal concept inventory shows significant improvement. Students also provided more mechanistic and detailed descriptions even as they struggle with precision of language. They perceived this course as different, challenging, accessible, social, and true to the label “inquiry.” A complete video and materials record of the course is available at the UNH Scholars Repository.