The ongoing process of urbanization is causing a surge in worldwide energy demand, with buildings currently consuming over one-third of total energy. This trend is expected to persist and intensify in the coming years. To tackle this challenge, a potential solution involves promoting the production of energy within the confines of buildings themselves. Various technologies, both active and passive, have been developed to facilitate the management and optimization of energy consumption in buildings using renewable sources. Such technologies include solar panels, Trombe walls, solar water heaters, solar chimneys, and building-integrated photovoltaics and photovoltaic thermal (BIPVT) systems. These systems take advantage of solar power, either to generate thermal and electrical energy or reduce the overall energy usage of building, thus contributing to the expansion of renewable energy sources. However, optimizing the efficiency of these systems presents challenges, particularly concerning cooling and stabilizing their energy output. Phase change materials (PCMs) provide a promising solution, offering multiple benefits such as the ability to store thermal energy as latent heat, regulate temperatures in photovoltaic panels, and reduce building heating and cooling requirements. This results in more efficient and sustainable integrated systems. In addition, the strategic integration of PCMs within various elements of a building’s structure can significantly reduce overall energy consumption.