This graduate HVAC class is intended to help strengthen understanding of thermodynamics, fluid mechanics, and heat transfer fundamentals and their application to HVAC equipment. It establishes a foundation of HVAC principles and then explores how to model and optimize building energy, comfort, and ventilation performance. Foundational HVAC principles include psychometrics and thermal comfort, HVAC loads and equipment sizing, mechanical equipment, and design and control strategies. Building modeling and optimization includes how to anticipate, achieve, and validate improved performance including energy savings. The class includes numerical problem solving and optimization using Python (no Python prerequisite) and the CoolProp library for thermodynamic properties. A foundation in thermodynamics, fluid mechanics, and heat transfer is extremely helpful. A project using operating buildings and HVAC equipment is a significant portion of the class effort and grade