This article proposes architectural strategies and comfort conditions for designing nearly zero-energy buildings (NZEBs) across different climatic regions of Iran, based on the Köppen-Geiger classification method and passive design techniques. According to the Köppen-Geiger climate classification, Iran's climate is divided into nine zones. The primary climatic zones considered in this study include Bwh, Bwk, Bsk, Bsh, Csa, Cfa, Csb, Dsa, and Dsb. The impact of climatic conditions on the design of nearly zero-energy buildings was analyzed using the Köppen-Geiger method. the selected cities within the mentioned climate zones were analyzed by the Climate Consultant software (CCS) in EPW format, utilizing the ASHRAE Standard 55 and also PMV (Predicted Mean Vote) comfort model. By inputting weather data from selected cities into CCS, output results including comfort conditions, natural ventilation, cooling, heating, and other parameters across the nine climatic zones were obtained. Additionally, during designing NZEBs, passive architectural parameters such as window shading, passive solar radiation, and internal heat generation in these nine climate zones were examined. The results showed that the BWh climate (Yazd) provides the highest thermal comfort at 19.7%, while the CFa climate (Anzali) provides the lowest thermal comfort at 3.6%. In the BWh climate, window shading, evaporative cooling, and internal heat gain have better conditions for comfort compared to other climates, with percentages of 16.8%, 25.8%, and 22.5%, respectively.