According to the Department of Energy, HVAC systems are responsible for about 40% of the total energy consumption. Increasing the energy efficiency of these systems can radically reduce the energy consumption. This paper aims to compare two case studies using different automated HVAC systems in terms of their energy efficiencies. Previously, HVAC systems were manually operated and monitored which made it quite tedious and inefficient. In the recent decades, integrating HVAC systems with IOT has turned out to be quite effective and efficient. Building automation systems and Building energy management systems are two such systems which use smart sensing networks. This paper analyses two case studies based on the different energy efficiency measures and performance of the automated HVAC systems. Further it discusses the importance of automation in increasing the energy efficiency, facilitates easy maintenance and makes the system cost effective.

Keywords : Heating Ventilation and Air Conditioning; Intelligent Building Management System; Building Automation System; Internet of Things; Programmable Logic Controller