, titled "Energy Standard for Buildings Except Low-Rise Residential Buildings," was a landmark update in building energy efficiency, providing the minimum requirements for the design and construction of new commercial buildings and their systems. Core Impact and Efficiency Gains
: 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
: Ramped up requirements for lighting and mechanical system controls to ensure equipment only runs when needed. Regulatory Role , titled "Energy Standard for Buildings Except Low-Rise
In the United States, Standard 90.1-2010 serves as a critical legal benchmark: Standard 90.1 - ASHRAE ashrae 90.1-2010