American Council for an Energy-Efficient Economy (ACEEE), Apr. 24, 2014, by Andrew deLaski.
http://aceee.org/blog/2014/04/long-winding-road-toward-efficient-fu

"The struggle for improved gas furnace efficiency standards may have an end in sight. Yesterday, the U.S. Court of Appeals for the D.C. Circuit approved a settlement between the Department of Energy (DOE) and an industry trade group. In the settlement, DOE agreed to pull back efficiency standards completed in 2011 and develop new standards in their place within two years. This new rulemaking represents another opportunity to set strong furnace standards which will save energy and cut consumers’ heating bills."