I have an application where we will be building multiple structures in close proximity that will share one geothermal heat pump. We want to use radiant floor to heat the structures, but we are not sure how to cool them. Since a geothermal heat pump can be used to create chilled water, how can we use this chilled water to cool the structures? Keep in mind this is in a humid climate in the summer time, so radiant cooling will not work because of he condensation that needs to be removed from the air. Is there some type of air handler/condenser that would perform this function in concert with a geo heat pump? Thanks! Kevin

Chilled water can be circulated throug hydronic fan coils. It works very well.
J

Chilled water is commonly used in commercial applications.
There are plenty of fan coils to choose from. For humid locations you should look into a coil that has more than 3 layers.

On the topic of chilled water, does anyon know how cold a heat pump can make a room/enclosed space? Refigerators that make dry ice, are they just specilized heat pump's? What about liquid nitrogen?  

Most refrigerators are heat pumps of one kind or another.
What about nitrogen?
j

Nitrogen and other liquids are made by compressing the gas.

Really cold temps can be achieved by combining two (or more, I guess) refrigerant cycles in series.