District cooling District cooling for air conditioning There are two ways to produce central district cooling. Using natural sources and generating chilled water via district heating and electricity. In both cases Vattenfall feeds the cold water produced into its central district cooling network. The cold water circulates in a closed loop between the central cooling station and the buildings. Cooling using natural sources Using natural cooling sources, for example lakes, a central cooling station produces cold water and feeds it into a district cooling network. Central district cooling control room Central control of the cooling stations ensures an optimised cooling service. Cooling based on district heating A central cooling station uses district heating and electricity to produce cold water and feeds it into a district cooling network.