This chapter explores the application of integrated passive design techniques appropriate for hot–-humid climates to provide indoor thermal comfort in traditional homes in Bushehr, a coastal city in southern Iran. To maximize airflow, reduce solar gain, and postpone heat transmission, architectural features including windcatchers, Shenashir, shaded courtyards, recessed entrances, and thick, light-colored walls were coupled with cultural customs and adaptable spatial utilization. By establishing internal microclimates, these design elements lessened the need for mechanical cooling systems. In order to reduce heat stress indoors, the chapter highlights the significance of thermal mass, seasonal spatial transitions, and buffer zones that are both horizontal and vertical. According to the research, these vernacular techniques, which are based on a thorough comprehension of climate and lifestyle, provide insightful information for modern sustainable architecture. In buildings exposed to harsh climates, its reinterpretation using contemporary materials and technologies can promote natural ventilation, increase energy efficiency, and improve thermal resilience.