The world’s most romantic river also helps prevent residents from getting all hot and bothered, cooling their offices and homes through a heat transfer system.

Currently, around 60 miles of piping channels water to and from the Seine in Paris, but it has nothing to do with plumbing. Rather, this network, which includes pumps and heat exchangers, naturally cool 800 Paris buildings.

The heat exchanger works by bringing the cool temperatures of the Seine’s undercurrent and using them to cool the air that circulates through the buildings. The water gradually absorbs the heat that was present in the air, and when it loses its cool, it returns to the Seine to deposit that thermal energy into the water.

Water is 800 times denser than air, so using it to store temperatures is much more efficien

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