There are two municipal connected heat pumps in Pierre, South Dakota. They are South Dakota Discovery Center and Pierre City Hall. Both systems now utilize plate heat exchanger between the city water loop and the building loop. In-coming water is pumped to a pressure of 110 to 120 psi (760 to 830 kPa) in order to reenter into the city water main. The water then passes through a plate-type of heat exchanger, 1 to 3F (1 to 2C), is removed or injected into the water. This heat removal or injection is due to if the building is in a heating or cooling mode