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Deep Lake Water Cooling for Residential (?)
Singh is right about the environmental agencies taking issue. I think it is more of an issue with compressorized components.
Lake Source Cooling at Cornell extracts cold water deep from near the bottom of the lake, runs it through plate heat exchangers and returns water that is still pretty cold, to the top of the lake. This is unlike what most condenser water systems use where the water is returned near 95 degrees....
Granted this is is hardly a scale your boss needs -or is it? :)
U.Mass Boston, near me, uses sea water as condenser water and have so for years. I rather doubt they could make a new plant that way today.