District heating is common in many northern European cities, even Italy (e.g 55% of households in Turino). The USA has 2500 (as of 2013) such heating and coolin

District heating is common in many northern European cities, even Italy (e.g 55% of households in Turino). The USA has 2500 (as of 2013) such heating and cooling networks https://en.wikipedia.org/wiki/District_heating https://en.wikipedia.org/wiki/District_heating district cooling https://en.wikipedia.org/wiki/District_cooling https://en.wikipedia.org/wiki/District_cooling