Geothermal heat for a pool

From a renewable energy forum.
"We installed a 5 ton geothermal water-to-water system to heat the radiant floors in our house. In our Maryland climate, our pool (25' x 50', 60,000 gal) gets too hot in the summer, so I ran supply and return lines from the house geo unit 400' underground to the pool for cooling in the summer. It works great! We also heat the pool during the shoulder seasons and that works great too. We turned the heating back to the floors in the house in late October, but we swam until then in 90 degree water. Geo works great for heating and cooling a pool, and our unit is 3 tons undersized for the quantity of water we heat and cool in the pool."

http://ths.gardenweb.com/forums/load/energy/msg061645333159.html