HVAC: Behind the scenes of the machines
U.S. Air Force Senior Airman Austin Bernsdorf, 7th Civil Engineer Squadron heating ventilation and air conditioning journeyman, twists a wrench while U.S. Air Force Airman 1st Class Yamila Guerrero, a 7th CES HVAC apprentice, holds the pulley puller in place at Dyess Air Force Base, Texas, Feb. 8, 2018. The HVAC team uses three different work orders, routine, urgent, and emergency, to determine which jobs need to be done first in a timely manner. (U.S. Air Force photo by Airman 1st Class Mercedes Porter)