ASHRAE Standard 90.1–2004
(2) Contents Such standards shall meet or exceed the requirements of the 2006 International Energy Conservation Code (hereafter in this section referred to as “the 2006 IECC”), or, in the case of multifamily high rises, the requirements of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers Standard 90.1–2004 (hereafter in this section referred to as “ASHRAE Standard 90.1–2004”), and shall be cost-effective with respect to construction and operating costs on a life-cycle cost basis. In developing such standards, the Secretaries shall consult with an advisory task force composed of homebuilders, national, State, and local housing agencies (including public housing agencies), energy agencies, building code organizations and agencies, energy efficiency organizations, utility organizations, low-income housing organizations, and other parties designated by the Secretaries.