Another benefit of using geothermal energy is you earn a tax rebate from it along with other federal benefits. Everyone knows that the government promotes green projects and other programs are beginning to subsidize system costs and installation costs to encourage homeowners to use renewable energy. This will not only benefit the homeowners with sustainable energy and huge cost savings, but it will also benefit our environment as well. It is imperative that people today seriously begin to consider the use of energy sources like geothermal energy.