AS 1•1990 AS 3•1992 AS 5•1994 YES 26•1996 AS 7•1996 AS 8•1997 YES 32•2002 YES 34•2004 YES 36.2•2006 AS 14•2006 YES 37.1•2007 PS 24.2•2008 AS 16•2009 YES 40.1/2•2010 YES 41.2•2011 PS 27.1•2011 SEER 91.1•2013 AS 20•2013 AS 21•2014 PS 30.2•2014 PS 32.2•2016 YES 50•2020