The potential energy savings chart shown below, an artifact from energy analysis within Vasari, leads to the following conclusions: the thermal properties of windows, walls, and roofs are three of the most important factors that can drive energy efficiency (with roof being relatively more important). This is seen by the size of the overall bars. Furthermore, the material choices that the designer has made are relatively good. This is seen by the portion of the bars that are on the right of the “current model” baseline (in darker blue).