As 90.1-2007 is essentially a compilation of addenda, we assume it may be treated in the way outlined by the official USGBC memo re:ASHRAE addenda. However, between 2004 and 2007 Appendix G was modified in some ways w/o addenda being published or approved, and these modifications were made official only by inclusion in the 2007 version. We further assume that we can use these modifications, as long as we use ALL the modifications in the 2007 App G and referenced sections of 90.1, similar to the guidance on addenda use previously given in the USGBC memo. Is this correct?
The applicant is asking whether ASHRAE 90.1-2007 Appendix G may be used in place of ASHRAE 90.1-2004 Appendix G to satisfy the requirements of the EA Minimum Energy Performance prerequisite (Note: if no energy model is submitted under EAc1, the project must comply with the prerequisite using either the Energy Cost Budget Method (Chapter 11) or the Prescriptive Method of compliance, and may not use the Appendix G method). It is acceptable to use ASHRAE 90.1-2007 Appendix G in place of ASHRAE 90.1-2004 Appendix G if the energy simulation follows the language of 2007 Appendix G in its entirety. Applicable Internationally.