Photo Essay: HVAC-R course teaches multi-faceted skills Published June 15, 2010 By Tech. Sgt. Vernon Cunningham 82nd Training Wing Public Affairs SHEPPARD AIR FORCE BASE, Texas -- Students from the Heating, Ventilation, Air Conditioning and Refrigeration course learn a variety of skills during their 20-week HVAC-R course at Sheppard Air Force Base, Texas, June 10, 2010. HVAC-R instructors teach heating and cooling fundamentals, combustion analysis, piping and hydronic systems, contingency refrigeration and other lessons as a part of their 21-blocks of instruction. To see the full slideshow, click here.