Designing energy efficient buildings requires an understanding of the energy impact of design features and how they interact with each other during the design process. This article outlines how and when an energy analysis can be conducted including guidelines for what to expect in an energy modeling analysis and how to interpret and understand the results. Guidance is provided in how to measure building systems and operations to align actual building performance with expected results from an energy modeling analysis. This article also describes several quick methods to do energy analysis at early design stages of the project. Resources are also provided to assist design teams in understanding the relative performance of proposed building designs compared to other similar building types in the industry.