Chilled water systems are used in medium and large-sized buildings. Chiller plants act as a centralized cooling system that provides cooling for an entire building or even multiple buildings. This is because it is often more practical to centralize air conditioning equipment in one location rather than install many pieces of equipment in many different places. In addition to simplifying access for a building’s maintenance crew, large water chilled systems also provide greater energy efficiency than smaller, individual systems. The chilled water loop consists of pipes and pumps that move chilled water around a building. A chilled water pump (CHWP) pushes chilled water through the chiller and through the chilled water line around the building. The chilled water that exits a chiller is called the chilled water supply (CHWS). The chilled water supply temperature is usually about 45 °F.