; and (bb) sustainable design principles are applied to the location, siting, design, and construction of all new Federal buildings and replacement Federal buildings; (III) if water is used to achieve energy efficiency, water conservation technologies shall be applied to the extent that the technologies are life-cycle cost effective; and (IV) if life-cycle cost effective, as compared to other reasonably available technologies, not less than 30 percent of the hot water demand for each new Federal building or Federal building undergoing a major renovation be met through the installation and use of solar hot water heaters. (ii) Limitation Clause (i)(I) shall not apply to unaltered portions of existing Federal buildings and systems that have been added to or altered. (B) Updates Not later than 1 year after the date of approval of each subsequent revision of the ASHRAE Standard or the International Energy Conservation Code, as appropriate, the Secretary shall determine whether the revised standards established under subparagraph (A) should be updated to reflect the revisions, based on the energy savings and life-cycle cost-effectiveness of the revisions.