This standard establishes the minimum level of seasonal energy efficiency ratio that must be met by central air conditioners, pack type and split type with cooling capacities of 10 540 W to 17 580 W. The minimum seasonal energy efficiency ratio (REEE) is 2.93 Wt / We. The standard NOM-011-ENER-2002 supersedes the standard NOM-011-ENER-1996. The 2002 version updates the testing method of the standard. the levels of REEE remain equal. This standard was then superseded by NOM-011-ENER-2006.