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In a move that will curb new construction and harm housing affordability nationwide, the U.S. Department of Housing and Urban Development (HUD) and U.S. Department of Agriculture (USDA) have issued a final determination that will require all HUD- and USDA- financed new single-family construction housing to be built to the 2021 International Energy Conservation Code (IECC) and HUD-financed multifamily housing be built to 2021 IECC or ASHRAE 90.1-2019.