Abstract: A sea water well source is used to supply cold sea water to a pair of serially connected thermal exchange systems. The sea water outflow from the second system is then supplied to an aquaculture preserve to provide nutrients in the sea water to marine life cultivated in the aquaculture preserve. The first of two heat exchange systems uses the cold sea water to cool a building or refrigeration unit. Alternatively, it may be used to condense fresh water from the air when the sea water is passed through coils. The second of the two heat exchange systems is a temperature-controlled agricultural system which uses the sea water output from the first heat exchange system to maintain the climate so as to grow agricultural products.