Radiant Floor Cooling
Radiant floor tubing can also be used to cool a house, but presently it is only appropriate for dry climates. The floor temperature is held at 68o F (20o C) by using either a small cooling machine (chiller) connected to the floor tubing or the steady 55o F (13 o C) temperature of the ground by means of an earth loop. In arid climates, the cool floor can be used to supplement or replace standard ducted air systems. However, in humid climates, problems with over-cooling the floor could lead to wet slippery surfaces and fungus growth. Radiant floor cooling technology is still in the experimental stages in most areas, but is rapidly gaining popularity in Europe where cooling needs are generally small.
Source:http://www.radiant-heat-floor-methods.com/radiant-cooling-floor.html