Can the system with Geothermal Heat Exchanger (comfofond) be used to heat and cool my home?

No, it will preheat or precool the incoming air keeping the core from freezing and making the unit more efficient. For a 2000 sf house, the amount of cooling it can provide is usually less than 2000 BTUs (for humid climates this will slightly dehumidify the air). It will, however, help redistribute the conditioned air for an evener household temperature. For additional heating options, check out our sister site RuntalElectric.com here.