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.

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

: Ramped up requirements for lighting and mechanical system controls to ensure equipment only runs when needed. Regulatory Role : Increased requirements for insulation and established new

: 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. ashrae 90.1-2010