Cerrudo Services demolished an existing HVAC control system and retrofitted and installed a new heating and cooling direct digital controls system at Buidling 544. Software and programming were performed for the sequence of operations, each AHU and the mechanical building. Graphics were designed to be user friendly with simple logic. All controls were made accessible from the Coast Guard intranet system as well as email notification of alarms. The building consisted of three stories of classrooms and offices. This project was completed during normal working hours and after hours in an occupied building which required maintenance of 70F heat and 74F cooling at all times.