The features of a chiller will vary based on the type of unit you have. A vapor compression chiller has a compressor, evaporator, condenser, and metering device. An absorption chiller will use a heat source instead of a compressor, and they use two fluids, including a refrigerant and an absorbent. They will both provide the same end result – cooler air or cooled equipment. They simply have slightly different components to achieve the same task. Some may have additional features such as emergency alarms and casters for easier movement.