Centrifugal pumps are widely used in HVAC systems for a variety of applications, including chilled water circulation, condenser water circulation, and hot water distribution. They are often used in conjunction with air handlers, chillers, and boilers to distribute fluids throughout the system. Centrifugal pumps are particularly well-suited for these applications due to their ability to handle large flow rates, high pressures, and varying system demands. Their reliability, efficiency, and low maintenance requirements make them a popular choice for HVAC system designers and operators.