Green Mortgages, are mortgages on energy-efficient homes. They allow home buyers to add as much as an additional 15 percent of the sale price into the loan, for upgrades such as energy-efficient windows, water heaters, or solar panels [1]. The Housing and Economic Recovery Act of 2008 includes a provision to streamline and promote green mortgages [1]. New York, Vermont and California are states that have enacted bills to promote green mortgages and The Green Resources for Energy Efficient Neighborhoods Act is currently being reviewed by congress.

Sources
1. Chang, Helen "Green Mortgages Offer New Growth". September 11, 2008. NuWire Investor.