The acronym ‘C.H.A.O.S.’ stands for Cooling and Heating for Architecturally Optimized Systems as well as our interest in the flow not only of energy in heating and cooling, but also the associated entropy (chaos) generation and how the quantification through exergy analysis can help optimize building systems. By leveraging the architectural design of surfaces and mass in building we can uncover opportunities for system integration that provide additional flexibility in the spaces and volumes created in the architecture, while also minimizing the chaos generated by the heat transfer processes of building systems.