Breadcrumb Home DEMR Diesel DEMR-1423 DEMR-1423: Heating, Ventilation, and Air Conditioning, Troubleshooting and Repair Download Catalog PDF Download Page PDF Program DEMR Diesel Lecture Hours 2 Lab Hours 6 Credit Hours 4 Course Type N Introduction to heating, ventilation, and air conitioning theory, testing, and repair. Emphasis on refrigerant reclamation, safety procedures, specialized tools, and repairs.