The paper postulates the feasibility and optimization of HVAC systems using programmable controllers. HVAC (heating, ventilating and air conditioning) systems are used for controlled maintenance of indoor ambient characteristics in optimal manner; with regards to outdoor ambient characteristics. The paper includes a simplified sequence of diagrams to represent the architecture of the system. Further, it also comprises of the systems and software's used for the same. Also, the paper gives an insight of the advantages of using programmable controllers, and the challenges which are overcome by it. For the ease of understanding a case study of a pharmaceutical company is given who is currently using the system. The main purpose of this project was to create a regulated monitoring system, integration of the utilities like electricity and water, creating a general report of the system for the given or needed time span, also to create a graphical visualization of the real time data and system.