Chillers have always been a popular choice to air condition large commercial buildings that are, by their nature, energy intensive. To service these types of buildings, a single 1,200-ton centrifugal chiller could require a compressor motor in excess of 900 hp. Engineers usually focus on a chiller’s efficiency (and rightfully so) as it often requires the single largest motor installed in a building. However, it is important not to become so centered on this single element of design that one loses sight of the energy use contributed by other HVAC components.