Most geothermal units are heat pumps designed for heating and cooling. They are designed to use a constant water supply at about 50 degrees to transfer heat from and to for conditioning the air. With proper trenches or drilled wells the water temp will change little regardless of the outside temperature or amount of sun. Solar only works when there is sun so it will not work at night, is less efficient on cloudy days etc.
Originally Posted by dave bishop
Will it work, probably, but most likely not worth the investment.
Be sure you live your life, because you are a long time dead.-Scottish Proverb