435.4—Energy efficiency performance standard.
(a)
All Federal agencies shall design new Federal low-rise residential buildings, for which design for construction began on or after January 3, 2007, to:
(1)
Meet ICC International Energy Conservation Code, 2004 Supplement Edition, January 2005 (incorporated by reference, see § 435.3 ), and
(2)
If life-cycle cost-effective, achieve energy consumption levels, calculated consistent with paragraph (b) of this section, that are at least 30 percent below the levels of the baseline building.
(b)
Energy consumption for the purposes of calculating the 30 percent savings shall include space heating, space cooling, and domestic water heating.
(c)
If a 30 percent reduction is not life-cycle cost-effective, the design of the proposed building shall be modified so as to achieve an energy consumption level at or better than the maximum level of energy efficiency that is life-cycle cost-effective, but at a minimum complies with paragraph (a) of this section.