Save Money with Geothermal You already own the property - why not use the free energy source just beneath the surface of your yard? A WaterFurnace geothermal system can transmit an astounding five units of energy for every one unit of electrical energy used. Not quite sure what that means to you? What you get is an proficient means to condition your Denver home - much less than what your friends and neighbors will pay. The geothermal products we install are the most efficient 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!