I am looking at the differences in a chiller (Chiltrix, Aermec ) to water versus a geothermal (Waterfurnace) to water system  I am looking at  radiant heat and radiant cooling for my new home. I am surprised at the advertised performance of some of  the chillers. Is anyone using a chiller for the heat/cooling? Any inputs good/bad/indifferent would be appreciated.

Take a look at this thread: http://www.greenbuildingtalk.com/Forums/tabid/53/aff/12/aft/84384/afv/topic/afpgj/3/Default.aspx#159069

Where are you located? Must find an experienced HVAC/Plumber.. for the Air to Water heat pump.

I am in Maryland. I read that thread. I think there is more of an install issue involved in that scenario.