DOE has developed three separate possible approaches to enforcement of regional standards for residential furnaces and residential central air conditioners and heat pumps set forth by direct final rule published in the Federal Register on June 27, 2011 (76 FR 37549). Adoption of these regional standards was addressed on October 31, 2011 (76 FR 67037). DOE intends to select one of these three approaches, or a combination of elements in these approaches, as a framework for an enforcement plan for regional standards. DOE is also considering a possible waiver process for regional standards applicability. DOE is required to promulgate an enforcement final rule covering the enforcement of regional standards "[n]ot later than 15 months after the date of the issuance of a final rule that establishes a regional standard." 42 U.S.C. 6295(o)(6)(G)(ii)(III). In a notice published in the Federal Register on June 13 2014 (79 FR 33870), DOE announced that it was forming a working group under ASRAC to develop proposed energy efficiency requirements for regional standards enforcement.