Save Money with Geothermal Free energy is waiting to be used and it's only several feet underneath the surface of your backyard. What are you waiting for? A WaterFurnace geothermal system extracts an astounding five units of energy for each electrical unit of energy used. Not quite sure what that means to you? What you get is an economical means to condition your Wilmington home - much less than what your friends and neighbors will pay. The geothermal products we place in your home are the most economical equipment in the industry today. So why not use the clean, renewable energy in your backyard and realize savings up to 70% on heating, cooling, and even hot water!