Since the outbreak of the energy crisis, researchers and scientists all over the world have been looking into possible ways to reduce energy consumption in habitable buildings, ranging from extremely conductive materials like stone, bricks, and AAC blocks to highly insulating materials like XPS, EPS, and a combination of various materials. Even though different progressive results suggest promising outcomes, a climate-adaptive material is necessary for variable seasons. One of the most significant solutions for the issue could be using phase change materials (PCMs) as building materials. PCMs, a novel compound, have attracted considerable interest in building design and construction. PCMs have emerged as a promising alternative for enhancing building energy efficiency and comfort due to their unique capacity to store and release thermal energy during phase transitions. It is possible to harness the latent heat characteristics of PCMs in building envelopes, walls, roofs, and other components to regulate internal temperature changes, minimize heating and cooling loads, and eventually lower energy consumption. It has the potential to significantly impact building sustainability and performance, making PCM inclusion an appealing field of research and application in modern building design. This study focuses on incorporating shape-stabilizing PCM in building walling assemblies and analyzing the suitability of a particular PCM at the various climatic zones in India.