A greener home is a greener bank account
Do you know the payback period of a high-performance, energy-efficient home? 5 years? 10 years?
Actually, with proper planning and financing, the payback begins IMMEDIATELY! Even if a green builder charges more for energy-efficient features (which SEED does not), you will still save right away. How does it work?
Consider this example: adding a few thousand to your mortgage for extra insulation will add little to your monthly mortgage payment, but you can plan on saving more per month in reduced energy costs! And do not forget about the amazing federal, state and local tax incentives offered for energy saving features! Be sure to talk to a knowledgeable financial advisor about all the potential savings that green homes have to offer.

Energy-efficiency makes as much sense economically as it does environmentally
Our homes will cut your power bill to half that of homes of similar size. Over time, you will save tens of thousands, if energy prices remain at today's level. If energy prices rise as expected, so do your savings.
Solarnomics
With all the variables associated with installing a photovoltaic (PV or solar panel) system on your property, determining the financial benefits of panels can be difficult. We call the study of these financial benefits solarnomics.

The DoE has a great section on the costs/benefits of a residential solar panel system. Also, check out this solar payback calculator for an idea of savings in your area.