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| Keywords: Sandia mechanical operations.jpg Sandia mechanical operations engineer checks out a heat exchange that's part of the labs' Free-Cooling System http //azrs com Air Conditioning Repair Phoenix Free cooling has helped Sandia cut energy usage by more than 250 billion BTUs the past six years and reduce greenhouse gas emissions Department of Energy photo 2012-12-06 15 34 22 https //www flickr com/photos/departmentofenergy/9396284268/ ENERGY GOV other versions PD-USGov United States Department of Energy | ||||
