Here's the definition of UEF: https://www.govinfo.gov/content/pkg/CFR-2016-title10-vol3/pdf/CFR-2016-title10-vol3-part430-subpartB-appE.pdf https://www.govinfo.

Here's the definition of UEF: https://www.govinfo.gov/content/pkg/CFR-2016-title10-vol3/pdf/CFR-2016-title10-vol3-part430-subpartB-appE.pdf https://www.govinfo.gov/content/pkg/CFR-2016-title10-vol3/pd... It would be really nice if manufacturers published delta-T vs COP curves.