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In winter the building is heated for a few hours on Monday morning and for the rest of the week the heat from people and office machines is usually enough to keep the building warm. At times it requires cooling in winter.
In summer the 12C water at times is enough to keep the building cool, if not the heat pump cuts in and assists.
The quantity of water pumped from the tunnel was more than required for the building, some of the water was sold to an adjacent insurance building under development at that time.
I believe the heat pumps were the largest in the world employed anywhere for heating/cooling a building at that time.
Story of how it extracted heat/cool from river water This article says the tunnel was the road tunnel. It is the rail tunnel water is extracted from.
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