This study looked at global comfort in a classroom in a tropical climate. Based on surveys and in situ data collection, the hierarchical multi-criteria analysis method was used to establish a model of the global comfort indicator. The weights obtained for each of the comfort components truly reflect the needs in terms of global comfort in a classroom in a tropical climate, with a high level of hygrothermal comfort, a high level of visual comfort and acoustic comfort, and a low level of olfactory comfort. The global comfort index for classrooms in a tropical climate, I_GSC, has been established and will be used as a tool for predicting global comfort in classrooms.