Ladia, I have pex tubing in the entire basement floor, in 6" of suspended concrete in the kitchen, and 3" suspended concrete in the master bath, but none of it is hooked up yet. I have not figured an easy way to use the geo system to warm these floors, since I am pretty much using all of the hot water the system produces for domestic.
You might want to consider using a Solar collector to heat water to supliment this system.
