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by clarkdave 634 days ago
Not sure about heat pumps, but in the UK at least there are a couple of companies that specialise in residential water cooled AC, e.g [0]. They use the cold water intake to cool down the compressor which sits inside the property

From a marketing perspective it’s not (as far as I’ve seen) driven by eco credentials, but by not needing planning permission - external AC compressors are not automatically permitted in the UK.

[0] https://www.urbancooling.com/water-cooled-air-conditioning