Do I keep my old furnace and AC unit, and have it converted to geothermal, or does it all get replaced?

When installing a geothermal heating and cooling system, your existing furnace or boiler is replaced with the highest efficiency water-to-air (furnace) or water-to-water (boiler) heat pump on the market. Along with the heat pump, a flow center and underground heat exchanger are installed to move FREE solar energy to and from your home. The same heat pump handles heating AND cooling, so your existing outdoor condenser is also removed.