From the same source:
http://www.thermo-flo...derfloor-heating.html
The Principle of Underfloor/Wall Cooling
With floor / wall heating the temperature of the surrounding surfaces is raised resulting in the most comfortable way of heating we know at this moment, namely, radiant heat.
With floor / wall cooling this principle is reversed. Cooled water flows though WTH underfloor heating tube which reduces the temperature of the surrounding surfaces creating a comfortable inner climate without the disadvantages that air cooling systems have, such as draughts and air pollution and expensive ducting. An additional advantage of floor / wall cooling is that the external construction of the building accumulates less warmth, reducing the heat built up.
To reply to buildersmate's question: Yes, I do know something about it as I have both friends and family with this kind of heating and cooling system.
There was no need for such a snide remark... how pompous!