What makes it tick?

Ray O'Briant, 2nd Civil Engineer Squadron Heating, Ventilation, Air Conditioning, and Refrigeration, modifies the power supply of a newly installed chiller as Ricky Ball, 2 CES HVAC/R observes on Barksdale Air Force Base, La., March 1. The HVAC/R's responsibilities include climate control for buildings and maintenance and repair of heating and cooling units. (U.S. Air Force photo/Airman 1st Class Andrew Moua)

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