This study investigates how the residents in Tiruchirapalli, India adapt to extreme summer temperatures within residential buildings, focusing on the hottest hours of the day. The research aims to understand adaptive behaviors to reduce dependence on mechanical heating and cooling systems, emphasizing the importance of innovative building designs.Methodologically, the study involves an extensive literature review and a questionnaire survey, overcoming challenges posed by post-COVID survey restrictions. It also highlights India's high energy consumption in the residential sector, driven by HVAC systems. Furthermore, it discusses the lack of standardized thermal comfort frameworks and the need for region-specific criteria.In the context of global warming and health concerns, the research underlines the significance of maintaining a comfortable indoor temperature. It also underscores the socio-cultural aspects and the preservation of cultural identity amidst modernization, offering insights into sustainable building designs that align with vernacular settlements. Overall, this study contributes valuable insights into adaptive behaviors, sustainable architecture, and energy-efficient practices in challenging climates, with implications for enhancing residents' thermal comfort, reducing energy consumption, and preserving cultural heritage.