The Internet of Things (IoT) is transforming the management of Heating, Ventilation, and Air Conditioning (HVAC) systems by enabling real-time monitoring and intelligent control. Buildings account for about 40% of global energy use, with HVAC systems consuming the largest share. Yet many HVAC operations are inefficient, wasting 20–30% of energy due to rigid controls and lack of feedback. This study investigates the impact of IoT integration on HVAC performance, focusing on improvements in energy efficiency and occupant comfort. We present a comprehensive analysis combining literature review, experimental case studies, and data-driven evaluation. The results demonstrate that IoT-enabled HVAC systems can significantly reduce energy consumption—often by 20–30% or more while maintaining or enhancing indoor comfort. Case studies from commercial buildings and campus facilities illustrate how smart sensors, connected thermostats, and data analytics optimize HVAC operation. Occupant comfort is addressed through adaptive controls and occupant feedback mechanisms, leading to more stable indoor environments. However, challenges such as data security, privacy, and integration costs remain and are discussed alongside future directions for widespread adoption. These findings underscore IoT’s potential to revolutionize HVAC systems, achieving a synergy between sustainability and human comfort in modern buildings
M.S. Chauhan (Wed,) studied this question.