Due to the complexity of ammonia refrigerators systems, one must first understand the function it needs to perform, the equipment present, and how the equipment is controlled before making any modifications. We studied the system and set up a custom simulation to understand its operation. Our simulation and experience allowed us to identify eight low-cost opportunities that could combine to reduce the system’s energy use by around 15%. These opportunities were in evaporator set-point optimization, ensuring system components operate correctly, modifying pressure set-points, and controls sequencing. We also identified and analyzed the impact of two potential capital-upgrades opportunities for consideration.