Originally Posted By: Blaine Wiley This post was automatically imported from our archived forum.
Ok Pete, here ya go. These are the York codes. Diamond 80 is a York (Unitary products) Furnace
YORK HVAC DATING
Note: they skip the letters I, O, Q, U, Z.
Year of make indicated by 3rd letter in the serial number.
1971 - A 1992 - A
1972 - B 1993 - B
1973 - C 1994 - C
1974 - D 1995 - D
1975 - E 1996 - E
1976 - F 1997 - F
1977 - G 1998 - G
1978 - H 1999 - H
1979 - J 2000 - J
1980 - K 2001 - K
1981 - L 2002 - L
1982 - M 2003 - M
1983 - N 2004 - N
1984 - P
1985 - R
1986 - S
1987 - T
1988 - V
1989 - W
1990 - X
1991 - Y
Copy, paste and print. Then glue them to your clipboard. You can tell the client the age of the furnace. That is, unless you memorize them like I did!
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