; and (B) in paragraph (2), by inserting after atypical the following: , or an appraisal on which the appraiser makes adjustments using an energy efficiency report. . (6) Protections (A) Authority to impose limitations The guidelines to be issued under paragraph (1) shall include such limitations and conditions as determined by the Secretary to be necessary to protect against meaningful under or over valuation of energy cost savings or duplicative counting of energy efficiency features or energy cost savings in the valuation of any subject property that is used to determine a loan amount. (B) Additional authority At the end of the 7-year period following the implementation of enhanced eligibility and underwriting valuation requirements under this section, the Secretary may modify or apply additional exceptions to the approach described in paragraph (2), where the Secretary finds that the unadjusted appraisal will reflect an accurate market value of the efficiency of the subject property or that a modified approach will better reflect an accurate market value. (7) Applicability and implementation date Not later than 3 years after the date of enactment of this Act, and before December 31, 2019, each covered agency shall implement the guidelines required under this subsection, which shall— (A) apply to any covered loan for the sale, or refinancing of any loan for the sale, of any home