B2Q Associates has extensive experience with several building modeling software tools accepted by utilities, U.S Department of Energy (DOE), and United States Green Building Council (USGBC). These can be applied to both new and existing buildings to compare system alternatives, calculate energy savings from each alternative, and evaluate the interaction between several options. Computer simulation models such as eQuest and Trane Trace are used during advanced stages of design evaluations to understand the impact of the building orientation, shading strategies, and building envelope alternatives to help optimize efficient building design.