Tech. Sgt. Steven Hernandez, Tech. Sgt. John Knapp and Staff Sgt. Tyler Olson, 386th Expeditionary Civil Engineer Squadron heating, ventilation and air conditioning technicians, perform an operational inspection on a field deployable environmental control unit at an undisclosed location in Southwest Asia, Feb. 6, 2019. The team of 19 HVAC technicians works around the clock to provide continuous maintenance and upkeep thousands of HVAC units installation-wide. (U.S. Air Force photo by Staff Sgt. Arielle Vasquez)