Psychrometrics is the study of the thermodynamic properties of moist air and its effect on materials and human comfort. Psychrometri cs applies the well understood relationships between humidity and temperature in the air to practical problems. HVAC system designers use these factors to model the HVAC requirements depending on the location of the building and the n eeds of the occupa nts or processes within it. This course explores how those factors are used to ensure an effective HVAC system, wh ile discussing how Psychrometric Charts are utilized to drive HVAC sizing and evaluation.