For more information please visit the Manufactured Housing website: http://www1.eere.energy.gov/buildings/appliance_standards/rulemaking.aspx?ruleid=97 
Section 413 of the Energy Independence and Security Act of 2007  (EISA) requires DOE to establish energy efficiency standards for manufactured housing. Specifically, EISA directs that DOE base the standards on the most recent version of the International Energy Conservation Code (IECC) (including supplements), except in cases in which the DOE Secretary finds that the IECC is not cost-effective, or a more stringent standard would be more cost-effective, based on the impact of the IECC on the purchase price of manufactured housing and on total life-cycle construction and operating costs.
DOE issued an advance notice of proposed rulemaking  (ANOPR) in the Federal Register on February 22, 2010, formally initiating the process of developing energy standards for new manufactured housing.
DOE published a request for information (RFI) regarding energy efficiency standards for manufactured housing. 78 FR 37995  (June 25, 2013). Written comments and information were requested on or before July 25, 2013.