Aire Flo Serial Number

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  • 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
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  2. The Aire-Flo 10-Year Extended Limited Warranty Program extends the basic coverage provided by the Aire-Flo Limited Warranty. Qualifying parts are covered for an additional five years beyond the basic warranty period. This provides a total of 10-years of warranty coverage on qualifying parts.
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  • 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..

Looking for more information about your Lennox product? Find your owner’s literature, like product manuals, by searching your product’s model number.


  • 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

Aire flo furnace

Aire Flo Air Conditioner Serial Number

  • 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
Aire Flo Serial Number

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

Aire Flo Serial Number Lookup

  • 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..

Aire Flo Ac Units


  • 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

Aire

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

Aire Flo Capacitor