Windows have long been recognized as the weakest link in a building's thermal envelope due to their inherently low thermal resistance and static transmittance, resulting in increased energy consumption. Integrating energyefficient Smart Switchable Glazing Systems (SSGS) has become a critical consideration for sustainable building design. In this study, we present an in-depth analysis of the technological innovations of passive and active systems, operational mechanisms, transmission characteristics, and thermal performance of SSGS. We conduct a rigorous systematic review and bibliometric analysis, examining the intersection of visual comfort and energy efficiency of SSGS, with a focus on the disadvantages of each in terms of performance switching speed and cost. Notably, we explore the novel implementation of SSGS within the context of the Kingdom of Saudi Arabia (KSA), which has opened the door for more comprehensive assessments prioritizing environmental implications, the challenges encountered, the level of adoption, and the corresponding benefits. Our findings indicate that incorporating these SSGS technologies not only addresses the environmental and energy challenges posed by the hot climate but also respects and enhances the cultural aspects of privacy and comfort deeply ingrained in Saudi society. EC glazing and SPD were demonstrated to reduce cooling loads and electrical demands, particularly during summer, contributing to energy conservation in desert climates. The use of PCMs in buildings in regions like Al-Jawf Province can, therefore, contribute to energy savings and enhance the sustainability of the built environment in areas with fluctuating temperatures. Furthermore, PDLC, PCM glazing, and Thermotropic provide privacy for the user when needed due to their translucent transition. This work aims to provide designers and policymakers with valuable insights into the optimal selection and integration of SSGS in the context of KSA, which aligns with the Vision 2030 goal of reducing carbon footprint and increasing the efficiency of the energy sector.