In 2004, Toronto began using cold water from 83 metres beneath Lake Ontario to cool downtown buildings; today the system serves 200 buildings across 40 million sq ft
Representative Image (AI-generated) Deep beneath the surface of Lake Ontario, a layer of naturally cold water has become an unlikely part of Toronto’s urban infrastructure. Instead of relying entirely on conventional air-conditioning systems to cool its downtown buildings, the Canadian city uses the lake’s cold temperature as a source of cooling energy. According to a…