Energy consumption in buildings represents 40% of the European Union’s whole energy consumption. In the US, 30% of all energy consumed by commercial buildings is related to inefficient operation of building equipment. Horizon 2020 Program encourages the design and construction of buildings that do not consume energy. US Department of Energy has been developing for many years the Energy Plus: a simulation code that allows energy consumption simulations of very complex climate control systems. However, this program does not address elements such as water-flow windows. In other occasions, the mathematical models do not correspond to reality. For all these reasons, it is necessary to develop parallel software for the evaluation by means of energy system simulations. Much effort is involved in codifying all of these configurations, even in the case of Energy Plus. The present work consists of the development of a simulation code based on abstractions, defined as components linked among each other by graphs. Once modeling each of the system’s components is done, the energy simulation of a specific installation scheme requires a minimum effort. A list of components or nodes define a list of arcs that link the different components in an automatic way.