The expansion of today’s concrete jungles is accelerating at an unprecedented pace and shows no sign of slowing any time soon. And while this expansion is necessary to accommodate a growing number of urban residents and workers, the systems that manage a building’s environmental controls have come a long way in terms of sophistication and performance. With each new building that is erected, a Building Automation System (BAS) is deployed to automate and monitor the building’s various environmental controls. Though many take these systems for granted, building automation systems are vital to living and working in comfort. A sophisticated building automation system can be used in buildings both new and old. Programming, installing, and monitoring of these systems requires a workforce with the skills necessary to ensure all components perform optimally with little to no downtime. The purpose of this article is to shed some light on what a BAS is, how it works, and why they are so important.