; (C) by inserting (1) after (a) ; and (D) by adding at the end the following new paragraphs: (2) The Secretary shall require, with respect to any single- or multi-family residential housing subject to a mortgage insured under this Act, that any approval or certification of the housing for meeting any energy efficiency or conservation criteria, standards, or requirements pursuant to this title and any approval or certification required pursuant to this title with respect to energy-conserving improvements or any renewable energy sources, such as wind, solar energy geothermal, or biomass, shall be conducted only by an individual certified by a home energy rating system provider who has been accredited to conduct such ratings by the Home Energy Ratings System Council, the Residential Energy Services Network, or such other appropriate national organization, as the Secretary may provide, or by licensed professional architect or engineer. If any organization makes a request to the Secretary for approval to accredit individuals to conduct energy efficiency or conservation ratings, the Secretary shall review and approve or disapprove such request not later than the expiration of the 6-month period beginning upon receipt of such request. (3) The Secretary shall periodically examine the method used to conduct inspections for compliance with the requirements under this section, analyze various other approaches for conducting such inspections, and review the costs and benefits of the current method compared with other methods.