COOLNOMIX, a patented compressor control retrofit designed to reduce air conditioning and refrigeration energy consumption, was evaluated at twelve DoD test sites. On-off testing in dry and humid climates was performed over two cooling seasons on six single-zone packaged and split air conditioning systems and six walk-in coolers. Cooling equipment, which tends to be oversized for typical part-load operation, can waste energy when compressors run longer than necessary. Using a sensor-based relay to intelligently cycle the compressor and modulate capacity, COOLNOMIX aims to supply just enough liquid refrigerant to cool the space, thereby reducing compressor runtime and saving energy. Targeting a 15% savings across up to 70 of cooling end-uses at DoD facilities could yield over 60 million in annual savings opportunity, or 1.5 of total facility energy utilization.