Staff Sgt. Aaron Washington (left) and Senior Airman Kevin Gillaspie, 633rd Civil Engineer Squadron heating, ventilation and air conditioning technicians, check the pressure on an HVAC system, Sept. 18, 2012, at Langley Air Force Base, Va. Data from this system can be tracked in one of the “legacy” systems used by the 633rd CES. (U.S. Air Force photo by Airman 1st Class Austin C. Harvill/Released)