Ashrae 90.1-2010 ✓

: Introduced more stringent equipment efficiencies and specific design requirements for hydronics and airside systems. It also mandated variable speed pump control for many chilled water systems.

: Updated Lighting Power Density (LPD) allowances and introduced more detailed methods for determining power allowances, such as the Space-by-Space Method. ashrae 90.1-2010

: Increased requirements for insulation and established new criteria for air barriers and fenestration (windows and doors). For example, it capped the maximum glazed area at 50% of the gross wall area and limited skylights to 5% of the roof area. ashrae 90.1-2010

In the United States, Standard 90.1-2010 serves as a critical legal benchmark: Standard 90.1 - ASHRAE ashrae 90.1-2010