Not necessarily. In addition to the upfront, short term cost, consider the long term costs of repair, maintenance, and replacement costs. To adequately assess the true cost of a green product, a life cycle cost analysis should be conducted. Life cycle costs examination evaluates each cost associated with each stage of a product from securing materials to disposal. This is an extremely involved and technical process. Your vendor or manufacturer may be able to provide this information.

Additional Resources
http://www1.eere.energy.gov/femp/program/lifecycle.html

http://www.fhwa.dot.gov/infrastructure/asstmgmt/lcca.cfm