REFG 231 will be a 2-hour long lecture-lab combination class. Some of the time will be spent lecturing, using academic course materials. The rest of the time will be spent in a lab setting, practicing the application of skills learned in theory. The class covers comfort and psychrometrics, system efficiency, EER, SEER, COP, AFUE, forced air duct design, lay out, and balancing. When available balancing will take place on site utilizing real buildings. The course includes classroom, traditional lab, and homework. Prerequisites: 1st year curriculum in HVAC-R or equivalent. Study will encompass the foundational theory that allows a technician in the HVAC/R industry to understand load on an air-conditioning system. In addition, the course will prove the efficiency of lab equipment on a given day. This shows students how they can determine the capacity of a system in an eventual customer building. We will construct a duct system in the lab and take measurements with air diagnostic equipment. This class may require participation in several field trips for further understanding of the profession.