I (Mark Brader) wrote:
Incidentally, a new air-conditioning system http://www.enwave.com
is now coming into use for major downtown buildings here in Toronto,
taking advantage of our location on Lake Ontario. Heat from these
buildings is transferred into water being drawn from the lake ...

Keith Chesworth:
The Liverpool Post & Echo Building used/uses water pumped from the
Mersey Tunnel ...

The difference is, water from the bottom of a deep lake is always at
4 degrees Celsius (the temperature where water is densest). Water
pumped out of a tunnel is going to be warmer than that.
--
Mark Brader, Toronto | "One thing that surprises you about this business
| is the surprises." -- Tim Baker

My text in this article is in the public domain.