NOTE: All documents linked from this page are in 
PDF-format.
Interpretation 90.1-2019-1 - June 1, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 6 and Table 6.8.1-16, regarding minimum efficiency requirements for heat pump and heat recovery chiller packages.)
Interpretation 90.1-2019-2 - June 1, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section 6 and Table 6.8.1-16, regarding minimum efficiency requirements for heat pump and heat recovery chiller packages.)
Interpretation 90.1-2019-3 - June 5, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Section G3.1.3.7, regarding Appendix G type and number of baseline chillers.)
Interpretation 90.1-2019-4 - June 5, 2020 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Tables 9.4.2-2 and G3.6, regarding Appendix G baseline building exterior lighting.)
Interpretation 90.1-2019-5 - March 31, 2021 (Refers to the requirements presented in ANSI/ASHRAE/IES Standard 90.1-2019, Sections 6.5.3.5 and 6.5.3.5.1, regarding supply air temperature reset.)