This paper gives an overview of dynamic modeling for energy systems related to vapor compression cycles. Basic components of these systems are described and equations of state are developed. For the heat exchangers, these equations of state are based on a moving boundary models. A reduction of system model order, and insight into primary dynamic modes, is presented. These reduced order models are an aid to control and diagnostic approaches. After developing the models, a software simulation environment, termed Thermosys, is introduced and used to validate the modeling efforts using a benchtop experimental system. Finally, a brief overview of control strategies is given. The intent is to present the typical controls engineer with a starting point for understanding and controlling these types of systems.