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Architectural engineers are committed to designing safe, efficient, and state-of-the-art structures for the community. Two major factors moving forward in the industry are sustainability and reducing carbon emissions. Carbon emissions profoundly affect the environment, primarily through climate change and global warming. Solutions to decrease carbon emissions can be achieved by reducing embodied carbon (selecting appropriate construction materials) and operational carbon (maximizing energy efficiency). This paper will focus on the thermal mass effects of concrete and how these thermal properties can be used to reduce carbon emissions. Concrete’s thermal mass properties can significantly impact the performance and sustainability of a building by influencing both energy consumption and regulating indoor air conditions by slowing down heat transfer. A case study investigated the effects of increased thermal mass in concrete walls versus the thermal and energy performance of buildings in different geographical locations throughout the United States. The results of different concrete wall thicknesses are compared by carbon emission output, energy demand, and overall cost. The findings will provide considerations for integrating high thermal mass into sustainable building design and offer insight for architects and engineers. The results indicate that thermal mass can positively affect a building's energy efficiency and carbon footprint for different regions.