This course is offered by Pacific Northwest National Laboratory (PNNL). The purpose of this course is to enable you to reduce operating cost and provide energy savings to the building a student is responsible for. Students will learn the initial steps involved in re-tuning a building controlled via a building automation system (BAS). Interactive exercises are included to provide students "hands-on" practice of the re-tuning process within a virtual building. Students will practice identifying opportunities for energy improvement and then deciding how to re-tune for more efficiency. The intended audience for this course is onsite employees responsible for day-to-day building operations; offsite contractors (retro-commissioning agents or control vendors) hired to improve a building's energy efficiency; and college students interested in entering this field. The focus is on large (100,000 sq. ft.) commercial buildings (office buildings, malls, and schools), but the concepts and techniques presented can be applied to any type and size of facility that has a BAS.