ASHRAE标准105提供了一种强制性语言的能源性能测定、表达和比较方法，可适用于任何建筑。它旨在提供一个通用的基础，用于根据交付的能源形式和能源性能表达报告建筑能源使用情况，比较设计方案，以及比较建筑内使用的能源资源和产生的温室气体排放的能源性能，以及建筑内的能源效率措施。该标准为采用机构和当局提供了很大的灵活性。2014年版标准105补充了现场能源测量方法，由采用机构选择确定一次能源和温室气体排放量。 一次能源和温室气体当量转换系数由采用机构自行决定。标准105附有可下载的补充文件，包括规范性附录A、B、C、D、E和F中所示的表格。

ASHRAE Standard 105 provides a method of energy performance determination, expression, and comparison in mandatory language that can be applied to any building. It is intended to provide a common basis for reporting building energy use in terms of delivered energy forms and expressions of energy performance, for comparing design options, and for comparing energy performance in terms of energy resources used and greenhouse gas emissions created, both across buildings and for energy efficiency measures within buildings. The standard provides a great deal of flexibility for adopting agencies and authorities.The 2014 edition of Standard 105 supplements site energy measurements with methods of determining primary energy and greenhouse gas emissions at the option of the adopting authority. Primary energy and greenhouse gas equivalence conversion factors have been left to the discretion of the adopting authority.Standard 105 is accompanied by downloadable supplemental files that include the forms shown in Normative Appendices A, B, C, D, E, and F.