The Psycho Tool is an interactive graphical Psychrometric Chart. Psychrometrics is basically the study of moist air, based on the relationship between air temperature and absolute humidity. In this tool, the various axis are explained as well as various thermal processes. Multiple points can also be plotted and the resulting values stored.

The Psycho Tool also contains an implementation of ISO 7730-1993 (E) for calculating the Predicted Mean Vote (PMV), a predictive measure of human comfort. The application allows for the interactive manipulation of all factors that affect the PMV comfort vote.