A new guide from Onset, “Using Data Loggers to Improve Chilled Water Plant Efficiency,” focuses on using data to evaluate the potential positive impacts to overall efficiency by controlling chilled water-coil differential temperature. The guide covers how to use portable data loggers at the individual coil level to help assess opportunities for saving energy and includes a case study describing a real-world deployment and analysis of collected data. A free copy of the guide can be downloaded online.