Buildings use a lot of energy, and cooling systems are a big part of that. Scientists found ways to make dual-temperature chiller plants more energy-efficient. They came up with two strategies: one adjusts how much work each chiller does, and the other also changes the air temperature. Strategy C saved more energy (16.4%) than strategy B (10.1%) over a whole cooling season. In hot months, most savings come from balancing the work between chillers in the same group. In milder months, balancing work between groups is just as important.