The U.S. Department of Energy (DOE ) has published new standards designed to increase the efficiency of furnaces and other products. 76 Fed. Reg. 67,037 (10/31/11). According to the agency, the new standards will require an efficiency improvement of about 13 percent for non-weatherized natural gas furnaces used in the North, starting in 2013. The rule for residential central air conditioners would require an 8 percent increase in efficiency in the South and Southwest. It would also set a national standard for heat pumps that will require about 8 percent more efficiency on average. According to news reports, several industry groups, including the American Gas Association, oppose the rule because it would eliminate from the market certain types of gas furnaces in the northern region of the United States. See BNA Daily Environment Report, October 31, 2011.