DMI employs sophisticated software modeling tools, such as DOE-2 and eQuest, to provide hourly simulation for advanced projects. Whole-building and hourly simulation is particularly suited to larger projects where multiple energy efficiency measures may interact to affect overall savings. For example, an efficient lighting measure may reduce the load on a chilled water system, which would affect the savings for an efficient chiller measure. Additionally, hourly simulation is also necessary for projects having advanced control strategies or complicated time-based load profiles, such as intermittent occupancy or process conditions.