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Consistent with the requirements under the Energy Policy and Conservation Act (EPCA), as amended, the U.S. Department of Energy (DOE) is seeking to establish a Federal test procedure for dehumidifying direct-expansion dedicated outdoor air systems (DDX-DOASes) under 10 CFR 431.96. For covered equipment addressed in the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 90.1, the DOE test procedure must be based upon the generally accepted industry testing procedure referenced in that industry consensus standard (42 U.S.C. 6314(a)(4)(A)). The statute further requires that each time the referenced industry test procedure is updated, DOE must amend the Federal test procedure to be consistent with the amended industry test procedure, unless there is clear and convincing evidence that the update would not be representative of an average use cycle or would be unduly burdensome to conduct (42 U.S.C. 6314(a)(4)(B)). Independent of that test procedure review obligation, EPCA also includes a 7-year-lookback review provision for covered commercial and industrial equipment that requires DOE to conduct an evaluation of each class of covered equipment to determine whether amended test procedures would more accurately or fully comply with the requirements that the Federal test procedure be representative of an average use cycle and not be unduly burdensome to conduct (42 U.S.C. 6314(a)(1)). In this test procedure rulemaking for DDX-DOASes, DOE is acting under its authority at 42 U.S.C. 6314(a)(4), and accordingly, it will propose and adopt a new Federal test procedure for this equipment. (The NOPR for this rule was mistakenly published in the Federal Register as RIN 1904-AD93 on July 7, 2021).