As the world experiences a steady increase in temperatures, population, and access to electricity, the global energy demand matches its growth. Accounting for roughly one-third of global energy consumption, the building sector is a leading contributor to greenhouse gas emissions, making it a crucial sector to decarbonize. Phase change materials (PCMs) have the potential to decrease the energy demands of buildings through their ability to store and release thermal energy. During warmer seasons, the storage of excess solar energy can reduce peak temperatures of a space and thereby reduce the need for space cooling. Coconut oil is a renewable and potentially low embodied carbon PCM with suitable properties for building integration; making it a potential alternative to the paraffinic PCMs that currently dominate the market. The aim of this study was to analyze the effects of integrating coconut oil into a building via in-situ comparative experimental analysis of two full-scale rooms with large south facing windows. One room, the test room, contained macroencapsulated coconut oil in vacuum sealed plastic bags, mounted within rigid insulation boards and installed behind drywall. The other room, the reference, included the same rigid insulation and drywall without any coconut oil. The encapsulation methodology and trends for the coconut oil within the cooling season are presented within the study. When compared to the reference chamber, the results suggest that coconut oil may be successful in buffering room temperature fluctuations and reducing maximum room temperatures. Alternate encapsulation and installation methods should be explored to demonstrate ways to increase the amount of coconut oil installed, while maintaining adequate exposed surface area and full phase transition.