1. ## Furnace Age Information

• Amana (1971-1995 Now owned by Goodman) uses (1st letter) “B L A C K H O R S E” code prior to being owned by Goodman
Example: BB80200127 = 1971 or 1981
• B-71,81,91,01
• L-72,82,92,02
• A-73,83,93,03
• C-74,84,94,04
• K-75,85,95,05
• H-76,86,96,06
• O-77,87,97,07
• R-78,88,98,08
• S-79,89,99,09
• E-80,90,00,10

• AirTemp 5th digit in S# = year (Only manufactured in 1977-1978)
• Airquest A letter followed by two #’s in S# are year.
Example: R883512345 = 1988
• American Standard (date on plate since 1987)
1) If S# is 9 numbers than (2002-present), the first digit of the serial number is the year followed by the week.
Example: 7165RHAIG = 16th week of 2007

2) If S# starts with a letter (1983-2001) a letter was used in the first position to designate the year followed by the week.
Example: B50632891 = Dec 87
• W = 83
• X = 84
• Y = 85
• S = 86
• B = 87
• C = 88
• D = 89
• E = 90
• F = 91
• G = 92
• H = 93
• J = 94
• K = 95
• L = 96
• M = 97
• N = 98
• P = 99
• R = 00
• Z = 01.

3) If S # is 6 numbers than a letter (1980-1982), 1980, 1981, 1982 the year is a letter in the 7th place. O = 80, T = 81, U = 82

4) If S# is number letter-4 numbers (1971-1979) In 70’s there was a number for year followed by letter for month ex 1C-xxxx = March 1971, etc..

• Arco-aire: A letter followed by two #’s in the S# = year ex: R883512345 = 1988
• Aire-Flo: 3rd and 4th digit in S# = Year ex 4604E13679 = 2004
• Armstrong: (1974-Present) 3rd and 4th number in S# = year ex 5899A05231 = 1999
Pre 1974 it was the first two numbers in the S# can call 800 448-5872 or 972-497-5799 (most are stamped on – See Lennox)
• Bard: ( June 1980 to Current) 5th & 6th digits in S# = Year
Example: 123A91123454502 = 1991
(1962 to March 1980) 8th digit = year.
Example: 123456 A D (D= 1964)
• 1962 = B
• 1963 = C
• 1964 = D
• 1965 = E
• 1966 = F
• 1967 = G
• 1968 = H
• 1970 = K
• 1971 = L
• 1972 = M
• 1973 = N
• 1974 = O
• 1975 = P
• 1976 = R
• 1977 = S
• 1978 = T
• 1979 = U
• 1980 = V

• Broan: (since 2005) 4th and 5th digits in S# = year (S# will start with letter)
Example: GT3050153269 = 2005
• Bryant: see Carrier
• Burnham: Must Call 888-432-8887
• Buderus: 2 types 603-552-1100
1) If order is like: 63036333-00-7080-3241
The third series of numbers is the Manufacture date- this tank was manufactured on the 80th day of 2007, so the first digit signifies the year and the next three signify the day of the year -
Example: 005, 065, 365

2)If order is like: 253000-08065-00040-77470007254 The second sequence is the year and day of the year the product was manufactured so-65th day of 2008.

• Carrier, Bryant, Payne, Day & Night:
Recently (last 20 years or so) 3rd and 4th digits in S# = year Through 1969, the first digit of the serial number indicates the year of manufacture.
Example: 3xxxxxx = 1963, 1970 and later, a letter followed by a number indicates the month and year of manufacture.
Example: A1 = January 1971, B1 = February 1971, C4 = March 1974 etc.
• Central Environmental Systems: see York
• Chrysler Air Temp: 2 types
1)Age is shown by the first digit of the serial number and corresponds to the last number of the year of manufacturer.
Example 0C893745 = 1970. 1 = 1971, 2 = 1972, etc. Use common sense and visual observation to distinguish decades from one another.

2) 5th digit in S# = year (8 = 1978)

• Climatrol: Call 817-221-3259
• Climate Master: First two digits of S# = Year
Example: 92J010915 = 1992
• Coleman: (1992-present) 1st two digits in S# = year , (pre 1992) 3rd and 4th digits in S# = year
• Columbia: Call 610-473-8457
• Comfortmaker: A letter followed by two #’s in S# = year ex: R883512345 = 1988

• Concord: 3rd and 4th digits in S# = year 1-800-448-5872
• Conquest: 1st two digits in S# after the last letter (usually beginning with the 8th digit) = year
• Day-Night: (since 1979 see Carrier) (Prior to BDP in Pre1979) Age coded into the serial number. First letter is the month followed by the second letter which is the year. A = 1970, B = 1971, Etc.
Example: AAxxxxxx = January 1970
• Dayton: A letter followed by two #’s in the S# = year
Example: R883512345 = 1988

• Ducane: 2 Types:
1) If serial # is all #’s then last four are year and week
Example: 4140720320 = 20th week of 2003

2) If 5th character is a letter (more recent) year is 3rd and 4th character
Example: 4603M12345 is 46th week of 2003
• Dunkirk: 3rd and 4th digits in S# = year
• Enterprise Fawcett: 2nd letter in S# = year
• A- 1975-2001
• B- 1976-2002
• C- 1977-2003
• D- 1978-2004
• E- 1979-2005
• F- 1980-2006
• G- 1981-2007
• H- 1982-2008
• I- 1983-2009
• J- 1984-2010
• K- 1985-2011
• L- 1986-2012
• M- 1987-2013
• N- 1988-2014
• O- 1989-2015
• P- 1990-2016
• Q- 1991-2017
• R- 1992-2018
• S- 1993-2019
• T- 1994-2020
• U- 1995-2021
• V- 1996-2022
• W- 1997-2023
• X- 1998-2024
• Y- 1999-2025
• Z- 2000-2026

• Evcon: (1992-present) 3rd and 4th digits in S# = year (pre 1992) 1st two digits in S# = year
• Fedders: Through 1977, the last two letters of the serial number show the month/year of manufacture, beginning with September 1964.
Example: xxxxAA = Sept 66, xxxxBC = Oct 68.(I is not used)
• First Company Service Parts: Call 214-388-5751
• Fraser: See York
• Frigidaire: (since 1998) 4th and 5th digit in S# = year, (pre 1989) last 3 digits in S# = year and month. See Nordyne
• General Electric: (Stopped in mid 80’s- Trane Since) Age is the last 3 digits of the serial number. First digit being the year and the second and third digits being the month.
Example xxxxx241 = 41st week of 1982, 92, 02 etc., xxxxx533 = 33rd week of 1985, 95, 05 etc.. Not very reliable. Look for evidence of age
• Gibson: 1st two Numbers in S# = year (usually 1st two digits in S# are numbers and = year) or see Nordyne
• Goodman: 1st two digits in S# = year (usually 1st two digits in S# are numbers and = year)
• Grandaire: 4th and 5th digit in S# = year
Example: GS3991251776 = 1999
• Heat Controller: 2nd and 3rd digits in S# = year
Example: 28903 160610 = 1989
• H.B. Smith: 1st two numbers (usually after one letter) in S# = year
Example: D86 2810P = 1986
• Heil (and Heil Quaker): 2 styles
1) (1994 to present) A letter followed by two #’s in S# = year
Example: R883512345 = 1988

2) (1980-1994) 1st two digits in S#, First letter is first number, so H7 I= 1987 (since H is the 8th letter in alphabet)
• Hydraulics Institute CAC/BDP: 3rd and 4th digits in S# = year
• Hydro Therm: The middle 4 numbers in the S# = year 413-564-5515
• Inter City: 1st two digits in S# = year
• Intertherm: 4th and 5th digits in S# = year (S# will start with letter)
• International Comfort Products: A letter followed by two #’s in S# are year
Example: R883512345 = 1988 May also be stamped on label
• Janitrol: 1st two digits in S# = year
• Johnson: see York
• Keeprite: 3 types
1) (1994-present)A letter followed by two #’s in S# = year.
Example: R883512345 = 1988

2) (1980-1993) 1st digit in S# = year
Example: 305123456 = 1983 or 1993

3) (1970-1994) The last letter in first series of letters = year
• S = 1970
• T = 1971
• U = 1972
• V = 1973
• W = 1974
• X = 1975
• Y = 1976
• Z = 1977
• A = 1978
• B = 1979
• C = 1980
• D = 1981
• E = 1982
• F = 1983
• G = 1984
• H = 1985
• “I” was not used
• J = 1986
• K = 1987
• L = 1988
• M = 1989
• N = 1990
• O = 1991
• P = 1992
• Q = 1993
• R = 1994

• Kelvinator: 4th and 5th digits in S# = year (S# will start with letter)
• Kenmore: 2 types (1994-present)
1) A letter followed by two #’s in S# are year
Example: R883512345 = 1988

2) (1980-1989) The first digit (a letter) is decade followed by a number
Example: H61139301 = 1986
• Lennox: (1974-Present) 3rd and 4th number in S# = year Pre 1974 it was the first two numbers in the S#
Many are stamped on label
800-448-5872 or 972-497-5799
• Lincoln: A letter followed by two #’s in the S# are year
Example: R883512345 = 1988

• Luxaire: see York
• Mammoth: see Nordyne (800) 222-4328
• Magic Chef: (only manufactured from 1984-1998) 8th digit (a letter usually second to last) = year.
Example: I04509EEB = 1984 (E-=1984)
• A = 1980
• B = 1981
• C = 1982
• D = 1983
• E = 1984
• F = 1985
• G = 1986
• H = 1987
• “I” was not used
• J = 1988
• K = 1989
• L = 1990
• M = 1991
• N = 1992
• O = 1993
• P = 1994
• Q = 1995
• R = 1996
• S = 1997
• T = 1998

• Magic Pak: (1974 - Present) 3rd and 4th digit in S# = year
• Maytag: (only since 2002) see Nordyne
• Miller: see Nordyne (800) 222-4328
• Modine: 3rd and 4th digits in S# = year (1st 2 are week, if week is 1-9 than the year is 2nd and 3rd digit in S# - [no 01,02 etc])
• Montgomery Ward: 1st four numbers after last letter in S# = week and year
Example: KP30102F52756585 =1975
• NEWMAC: 4th and 5th digit in S# = year
Example: NL2 021803 D036000 = 2002
• New Yorker: usually printed on label or see Oneida Royal
• Nordyne: (800) 222-4328: 4th and 5th digits in S# = year (S# will start with letter)
Example: GT3050153269 = 2005
• NuTone: see Nordyne (800) 222-4328
• Oneida Royal: 1st two digits in S# = year
• Payne: see Carrier
• Peerless: (pre 1984 no date of manufacture) (1984-2000) the last series of numbers are month and year.
Example: JO-12345-1084 = 1984. (2000-present)
same idea only it was a six digit date code following the serial number that is year and month.
Example: 1234567-200105 = May of 2001. Anything w/o the addition to the serial number would have been made before 1984 and would require contact with the factory.
• Pennco: A letter followed by 4 #’s, 3rd and 4th #’s = year
Example: P390200032 = 2002
• Penstan Air-ease: 3rd and 4th digits in S# = year
Example: 8404506602 = 2004
• Philco: See Nordyne
• Republic: 1st four numbers after last letter in S# = week and year
Example: DC5D702F280123456 = 2001
• Reznor Call 1800-695-1901 (chart at home)
• Rheem/Ruud: (1970’s to present) the 4 #’s after the last letter in the S# = wk/yr
Example: CB5D302F099903346 = 1999
(1955 to early 1970’s) the last 4 numbers of S# = week and year
Example: 123451872 = 1972
• Rinnai: 1st two digits in S# = year
ex 010912345 = 2001
• Sears: 3 types
1) A letter followed by two #’s in S# are year
Example: : R883512345 = 1988

2) (1980-1989) The first digit (a letter) is decade followed by a number
Example: H61139301 = 1986

3) If S# is all #’s, 3rd and 4th are year
Example: 22880018 = 1988
• Slant Fin: 1st two #’s after the letter in S# = year
Example: G0049257 = 2000
• Snyder General: A letter followed by two #’s = year
Example: R883512345 = 1988
• Tappan: Last two #’s in S # = year (then a letter for month) or See Nordyne
• Tempstar: (1990-present) A letter followed by two #’s in S# = year
Example: R883512345 = 1988
• Thermo-Pride: Must call 574 896-2133
• Trane: (date on plate since 1987)
1) If S# is 9 numbers than (2002-present), the first digit of the serial number is the year followed by the week.
Example: 7165RHAIG = 16th week of 2007

2) If S# starts with a letter (1983-2001) a letter was used in the first position to designate the year followed by the week.
Example: B50632891 = Dec 87
• W = 83
• X = 84
• Y = 85
• S = 86
• B = 87
• C = 88
• D = 89
• E = 90
• F = 91
• G = 92
• H = 93
• J = 94
• K = 95
• L = 96
• M = 97
• N = 98
• P = 99
• R = 00
• Z = 01

3) If S # is 6 numbers than a letter (1980-1982), 1980, 1981, 1982 the year is a letter in the 7th place.

• O = 80
• T = 81
• U = 82

4) If S# = number than letter-4 numbers (1971-1979) In 70’s there was a number for year followed by letter for month
Example: 1C-xxxx = March 1971, etc..

• Ultimate: Last two digits in S# = Year
• Union Energy: 3rd and 4th digits are year
Example: 2701E15232 = 2001
• Utica Boiler: 2 types
1) (1979-2002) 1st letter = month, 2nd letter = year
Example: HT11826 = 2006

• I=79
• J=80
• K=81
• L=82
• M=83
• A=84
• B=85
• C=86
• D=87
• E=88
• F=89
• G=90
• H=91
• P=93
• R=94
• S=95
• T=96
• U=97
• V =98
• W=99
• X=00
• Y=01
• Z=02
• UA=03

2) (2003-present) 1st and 3rd letter of S# = year
Example: UAA23456 = 2006

• U_A = 2003
• U_B = 2004
• U_C = 2005
• U_D = 2006
• U_E = 2007
• U_F = 2008
• U_G = 2009
• Westinghouse: 4th and 5th digits in S# = year (S# will start with letter)
Example: GSD060700023 = 2006
• Whirlpool: Begins in 1970. The letter indicates the decade followed by the week. G = 1970's, H=1980's, J=1990's, K=2000's
Example: H416XXXXX = 16th week of 1984
• Williamson ThermoFlo: Goes by CP# Must call (800) 736-2378 or (800) 736-BEST
• YORK: (Unitary Products since 1984) (most have date on plate) Call 877 874-7378 or 188 231-4822
1) (2004-Present) 1st and 3rd # in S# = year Example: 0A5123456 = 2005

2) (1971-2004) The 3rd digit (a letter) = year
Example: EFBM210830 = 1972 or 1993
• A = 1971 or 1992
• B = 1972 or 1993
• C = 1973 or 1994
• D = 1974 or 1995
• E = 1975 or 1996
• F = 1976 or 1997
• G = 1977 or 1998
• H = 1978 or 1999
• I was not used
• J = 1979 or 2000
• K = 1980 or 2001
• L = 1981 or 2002
• M = 1982 or 2003
• N = 1983 or 2004 (except October, November, and December. See below.)
• O was not used
• P = 1984
• Q was not used
• R = 1985
• S = 1986
• T = 1987
• U was not used
• V = 1988
• W = 1999
• X = 1990
• Y = 1991

• Water Furnace: 3rd and 4th digits in WO# = year
• Weil-McLain: CP # Ranges
• 2009= 5957347
• 2008= 5731064 5957346
• 2007= 5454498 5731063
• 2006= 5301001 5454497
• 2005= 5047001 5301000
• 2004= 4807001 5047000
• 2003= 4587000 4807000
• 2002= 4311001 4586999
• 2001= 4055001 4311000
• 2000= 3810001 4055000
• ​1999= 3621001 3810000
• 1998= 3441401 3621000
• 1997= 3213001 3441400
• 1996= 3003001 3213000
• 1995= 2815001 3003000
• 1994= 2609501 2815000
• 1993= 2400000 2609500
• 1992= 2217400 2399999
• 1991= 2056001 2217399
• 1990= 1871501 2056001
• 1989= 1681501 1871500
• 1988= 1414001 1681500  Reply With Quote

2. ## Re: Furnace Age Information

Thanks Brian, This link is also a good one. HVAC -PRODUCTION DATE/AGE | Building Intelligence Center  Reply With Quote

3. ## Re: Furnace Age Information Originally Posted by wayne soper Thanks Brian, This link is also a good one. HVAC -PRODUCTION DATE/AGE | Building Intelligence Center
Agreed. The website has some holes in its library but is a good resource and is my first stop for appliance ages when I am in doubt. The serial and model # examples they provide are idiot proof.  Reply With Quote

4. ## Re: Furnace Age Information Originally Posted by wayne soper Thanks Brian, This link is also a good one. HVAC -PRODUCTION DATE/AGE | Building Intelligence Center
Thanks, you are super. This link is great help.  Reply With Quote

5. ## Re: Furnace Age Information

That is terrific info thanks for sharing.  Reply With Quote

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