Abstract: Implementations of the present disclosure involve a system and/or method for analyzing the energy efficiency of a building. The system receives a set of data points from a building automation system operating to control various aspects of the building. The data points each corresponds to an environmental condition of the building. Each data point is associated with a variable that represents the represents a type of information conveyed by the data point. Variables are then mapped to component models that represent the physical components of the building. A formula is then selected for evaluating the operation of one or more physical components. Building problems are then diagnosed by evaluating the formula using the data points.