The RLW engineering team has extensive experience using the DOE-2 building simulation program. DOE-2 performs 8,760 hourly simulations of a structure's expected energy use and energy cost given inputs on the building's climate, architecture, materials, operating schedules, and HVAC equipment. DOE-2 is widely used in the United States and 42 other countries to design energy-efficient buildings, to analyze the impact of new technologies and to develop energy conservation standards. While the fundamental benefit of a DOE-2 simulation is a thorough understanding of a building's overall energy performance and end use consumption, the model is perhaps most valuable for providing a mechanism to investigate "what-if" scenarios without financial or performance risks. By utilizing our Visualize-IT™ data visualization techniques for hourly engineering model calibration, RLW became recognized as a leader in DOE-2 model development and calibration. RLW's calibration methods have been featured in national conferences and in EPRI sponsored workshops. Once armed with a calibrated building model, an engineer is equipped to investigate the energy impact of any change in the facility's design, loads, or systems.