A geothermal system will not only be the most cost saving and environmentally safe system for you and your family, it will give you the comfort you seek in your new home. A new geothermal system would be one of the best investments you can make to save on your future energy cost. For a typical 1500 square foot home the cost for installation is between $30,000- $40,000*. A new oil or gas furnace cost on average $20,000-$25,000* . When considering all of the incentives offered from your particular state and federal government agencies, it can cost you the same if not less. Plus, you will save much more in the years to come.