Aire Flo Serial Number

Number

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. 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. 3rd and 4th digit in S# = Year. Ex 4604E13679 = 2004. Aire-flo® How to determine the date of production/manufacture or age of Aire-flo® HVAC Systems. The date of production/manufacture or age of Aire-fl0® HVAC equipment can be determined from the serial number located on the data plate. To locate your air conditioning system in the AHRI directory without an AHRI Reference Number, you will need the manufacturer’s name, model name, and model number, for both the indoor and outdoor units. How to install a52codec.component windows. This information should be on the equipment’s warranty, your sales invoice and on the units themselves.

  • 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.

Aire Flo Ac Age


  • 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.
Number
  • 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

  • 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

Aire Flo Ac Units

  • 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

Aire Flo Serial Numbers

  • 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

Aire Flo Hvac


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