en Architecture Architecture Research Paper Research Paper <span style="font-size:12pt"><span style="line-height:normal"><span new="" roman="" style="font-family:" times=""><span lang="EN-GB" style="font-size:11.0pt">Various methods have been employed in vernacular architecture, to achieve energy efficiency in different regions worldwide, especially in facade designs. In Iran, most vernacular buildings are still in use without major modifications and renovations, even in harsh climatic conditions. This study uses mathematical analysis to conduct a quantitative approach toward principles used in the fa&ccedil;ade design of Bushehr&#39;s vernacular architecture. The research critically examined the physical characteristics of eight residential buildings, which were selected as case studies. These parameters included window-to-wall ratios, the surface area for each facade, and the size of different openings concerning height and weight. These physical characteristics of the selected houses were systematically extracted for both the interior and exterior facades, delineating eighteen criteria. The statistical analyses were done using IBM SPSS Statistics version 16.0. The results revealed fourteen linear models&mdash;six models related to the exterior facades, five models concerned with interior facades, and three models about the opening. Although the linear models are specific to the vernacular architecture of Bushehr, the research method and approach outlined in this study have the potential to contribute to a framework that can be used by other researchers to uncover underlying principles in vernacular facades elsewhere around the world.</span></span></span></span><br> &nbsp; Façade design, Vernacular Architecture, Hot-Humid Climate, Iran, Bushehr 0 0 http://ijaup.iust.ac.ir/browse.php?a_code=A-11-1040-1&slc_lang=en&sid=1 Parastoo Eshrati eshrati@ut.ac.ir 180031947532846006899 180031947532846006899 No School of Architecture, College of Fine Arts, University of Tehran, Tehran, Iran. Roza Vakilinezhad arch.rv@shirazu.ac.ir 180031947532846006900 180031947532846006900 Yes School of Art and Architecture, Shiraz University, Shiraz, Iran. Arezoo Ghahramani Ar.ghahramani1992@gmail.com 180031947532846006901 180031947532846006901 No School of Architecture and Environmental Design, Iran University of Science and Technology, Tehran, Iran. Dorna Eshrati deshrati@bsu.edu 180031947532846006902 180031947532846006902 No Department of Landscape Architecture, R.Wayne Estopinal College of Architecture and Planning, Ball State University, Muncie, IN, USA. Mohammad Kazem Namazi kazemnamazi@ksu.edu 180031947532846006903 180031947532846006903 No College of Architecture Planning and Design, Kansas State University, Kansas, USA.