My first energy modeling assignment was for a building that was nearing the end of construction. The owner wanted a second opinion, or third-party energy model, to see how it would compare to the energy modeling results given by the design team for LEED certification. What they really wanted to know was how much they should expect to pay for utilities during their first year or two, because they were a national real estate developer trying to predict the future of their investment. Since this introduction to the powerful tool of energy modeling, my mind has been focused on proving to myself and others that the most useful investment for energy modeling is to influence the building envelope and architecture design at...