I've done busieness with lots of companies but I've never ever had the awesome level of customer service I got from Geo Systems USA for my Geo Pulse geothermal flow center. They are just amazing. Beyond that, the Geo Systems USA Geo Pulse flow center is a better quality unit for a better price than their main competition, the QT flow cetner.
I installed my own geothermal heating and cooling system. I had never done this before and I had questions about everything. Geo Systems USA bent over backwards to help me, to answer every question I had, to call me back and make sure everything worked perfectly, and to provide outstanding service years after the sale.
If you are going to install geothermal, you can't do better than Geo Systems USA.