1. don't waste your money, hot water heat is most efficient.
2. even if you want to do it, 40k for 2 units? omg I can fly over there and do it cheaper..lol
3. everyone claim geothermal is energy efficient, but it is expensive the maintain, every brand is different, there are no after market parts, meaning only the contractor whom installed it, can maintain it, and you be bleeding to death with that repair bill..