The amount that you will save on energy costs with a geothermal system can range depending on where your home is located. Both your region and your actual land that your home is built on will factor into the costs.
In regards to energy-saving with geothermal energy, The U.S. Department of Energy stated:
“(Geothermal heat pumps) are up to 65 percent more efficient than traditional HVAC units and pay themselves back over time in energy savings — typically within 10 years,” (6)
So while their upfront costs are significant, they can definitely be worth it over time.