ASHRAE/IES 100:2015

This revision of Standard 100-2006 provides greater guidance and a more comprehensive approach to the retrofit of existing buildings for increased energy efficiency and addresses major and minor modifications for both residential and commercial buildings and single and multiple activity buildings with variable occupancy periods and it identifies the approach for 53 building types (Per CBECS and RECS) in 16 climate zones. It identifies requirements for buildings with and without energy target and provides multiple levels of compliance. After review of comments and further committee work the following independent substantive changes are offered for public review.