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Here is an article by RESNET detailing the SEER2 changes. Probably a pretty reputable source.

https://www.resnet.us/articles/resnet-addresses-whats-next-with-seer2/

OpenStudio-HPXML converts SEER to SEER2 using ANSI/RESNET/ICC 301-2022 Addendum C, where SEER = SEER2 / 0.95 if ducted and SEER = SEER2 if ductless.

Here is an article by RESNET detailing the SEER2 changes. Probably a pretty reputable source.

https://www.resnet.us/articles/resnet-addresses-whats-next-with-seer2/

OpenStudio-HPXML converts SEER to SEER2 using ANSI/RESNET/ICC 301-2022 Addendum C, where SEER = SEER2 / 0.95 if ducted and SEER = SEER2 if ductless.

Here is an article by RESNET detailing the SEER2 changes. Probably a pretty reputable source.

https://www.resnet.us/articles/resnet-addresses-whats-next-with-seer2/

OpenStudio-HPXML converts SEER to SEER2 using ANSI/RESNET/ICC 301-2022 Addendum C, where SEER = SEER2 / 0.95 if ducted and SEER = SEER2 if ductless.

https://openstudio-hpxml.readthedocs.io/en/v1.8.1/workflow_inputs.html#id637