# AIR CONDITIONING AGE & CAPACITY

## Home Inspection Services | Professional Home Inspection Services

AIR CONDITIONING AGE & CAPACITY

As a rule-of-thumb, capacity information is encoded by air conditioning manufactures in the model number and date of
manufacture info in the serial number.

There are 12,000 Btu’s per ton of cooling, and air conditioners are sized by every ½ ton.
Manufacturers often encode the approximate rating in Btu’s somewhere in the model number. THEREFORE IT IS OFTEN SIMPLE TO SCAN THE
MODEL NUMBER FOR A TWO-DIGIT NUMBER THAT IS DIVISIBLE BY 6 AND TO DIVIDE IT BY 12 TO
DETERMINE THE CAPACITY RATING IN TONS.
This number can be elusive, as it is not always exactly divisible by 6.
Some manufacturer’s systems make this easier than others. To complicate matters, some manufacturers have
changed their systems of encoding data over time.

AMANA
Age: Use B-L-A-C-K H-O-R-S-E code B = 71 or 81 H = 76 or 86
L = 72 or 82 O = 77 or 87
A = 73 or 83 R = 78 or 88
C = 74 or 84 S = 69, 79 or 89
K = 75 or 85 E = 70, 80 or 90

BRYANT
Capacity: Look for those elusive two digits in the model number usually (but not always) divisible by 6 and divide by 12
to convert to tons.
Example: 56BAB0042000A0
42 = size on thousands of BTU
42,000 Btu = 3½ ton
From 1964 through 1979 Bryant encoded age information in the R = 1964 A = 1972
serial number with the first two digits indicating week of S = 1965 B = 1973
manufacture and the letter following those first two numbers T = 1966 C = 1974
indicating the year beginning R = 1964: U = 1967 D = 1975
V = 1968 E = 1976
W = 1969 F = 1977
X = 1970 G = 1978
Y = 1971 H = 1979
In subsequent years Bryant simplified its system where, the first two digits of serial number = Week of manufacture.
Third & fourth digits = Year of manufacture. Example: 3188XXXXXX = 31st week of 1988.

CARRIER
Carrier has used several different codes at different plants. Information below refers to commonly used codes.
Capacity: Commonly found in the last three to five digits of model number, sometimes in 100s of Btus sometimes in
tons
Example:
001 = 1.5 ton, 002 = 2 ton, 003 = 2.5 ton, 004 = 3 ton, 004-5 = 3.5 ton, 005 = 4 ton, 006 = 5 ton
Or
18xx = 1.5 ton, 24xx = 2 ton, 30xx = 2.5 ton, 36xx = 3 ton, 42xx = 3.5 ton, 48xx = 4 ton, 60xx = 5 ton
Or
14xx = 1 ton, 18xx = 1.5 ton, 024 = 2 ton, 030 = 2.5 ton, 036 = 3 ton, 042 = 3.5 ton, 048 = 4 ton, 060 = 5 ton

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Age: Through the 1960s Carrier used the first digit of the serial number to indicate the year of manufacture. Example:
3xxxxx = 1963, 4xxxxx = 1964, 5xxxxx = 1965, etc.
Beginning in 1970 Carrier began to use a letter followed by a single digit year.
Example: A1 = January 1971, B2 = February 1972, M5 = December 1975
Note: No letter I
A=Jan G=Jul
B=Feb H= Aug
C=Mar J= Sept
D=Apr K= Oct
E=May L= Nov
F= Jun M= Dec
More recently Carrier has simplified things using the first four digits of the serial number to signify the age, where the
first two digits indicate the week and the third and fourth digits indicate the year of manufacture (similar to Bryant).
Example: 3298xxxxxx = 32nd week of 1998

CHRYSLER AIR TEMP
Capacity: Rating in tons found in the fourth and fifth digits of the model number
0 = 1 1.5 ton
2 = 2 ton
3 = 2.5 ton
4 = 3 ton
5 = 4 ton
6 = 5 ton
Example: xx06xxxx = 5 ton

CLIMATROL
Capacity: Look for those elusive two digits in the model number (usually, but not always) divisible by 6 and divide by 12
to convert to tons. It is often in the last three to five digits, but is sometimes closer to the middle.

COASTLINE
Capacity: Look for those elusive two digits in the model number (usually, but not always) divisible by 6 and divide by 12
to convert to tons. It is often in the last three to five digits, but is sometimes closer to the middle.

COLEMAN
Coleman has used several different codes at different plants. Information below refers to some commonly used codes.
Capacity: Commonly found in the third and fourth digits of the model number sometimes in 100s of Btu’s and
sometimes as tons.
Example: xx30 = 2.5 ton, xx48 = 4 ton or xx02 = 2 ton, xx05 = 5 ton

DAY-NIGHT LATER MANUFACTURED AS “BDP” (BRYANT, DAY-NIGHT, PAYNE)
Capacity: Look for those elusive two digits in the model number (usually, but not always) divisible by 6 and divide by 12
to convert to tons. It is often in the last three to five digits, but is sometimes closer to the middle.
Age: First two letters of the serial number indicate age, where the first letter is the month and the second letter the year
of manufacture beginning with 1970
A=1970, B=1971, C=1972, Etc.

DUCANE
Two different formats on serial numbers are used. All of serial numbers are ten characters.
The most common format is all ten characters are numeric. In this format the numbers in position 7 and 8 indicate the
calendar year and the numbers in position 9 and 10 indicate the week of the year.
Example is XXXXXX9933 where the 99 would be 1999 and the 33 would be the 33rd week of the year (1999).
The more recent format is ten characters. The format is that the first four characters are numeric, the fifth character is
alpha, and the last five characters are numeric.
The year code is determined from the numbers in the 3rd and 4th position, which would be the last 2 digits of the
calendar year (ex: 06=2006). The fifth character which is alpha represents the month with A=January and
M=December and but they do not use the LETTER I.

FEDDERS
Capacity: Last two digits of the model number indicate 1000s of Btus
Example: CF30 = 2.5 ton
Age (through 1977): Last two letters of serial number
indicate month & year beginning with September 1966
A=Sept
B=Oct
C=Nov
Etc
A= 1966
B=1967
C=1968
Etc.
Note: I – not used
Example:
xxxxAA = September 1966, xxxxBC = October 1968

GENERAL ELECTRIC
Capacity: Last three digits of model number indicate approximate rating in 1000s of Btus
Example: 21TC030A = 2.5 ton
Age: Last three digits of serial number indicate date of manufacture, where the first digit indicates the year and the
second and third indicate the week
Example: xxxxxx241 = 41st week of 1982

KEEPRITE
The date of product/ manufacture or age of a Keeprite furnace or air conditioner can be determined from the serial
number Serial number styles/ formats found:
Style 1: G051650885, Style 2: L920671787, Style 3: 9414B39332
First two numbers represent YEAR. Second two represent WEEK.

LENNOX
Capacity: Lennox has its own code found between hyphens in the model number
211=1.5 ton 411=3 ton 651=4.5 ton
261=2 ton 461=3.5 ton
311=2.5 ton 511=4 ton
Example: CHP16H-261-1P = 2 ton
Age: Prior to 1974 the first three digits of the serial number indicate the date of manufacture where the first two digits
indicate the year and the third is the month.
Example: 732xxxx = February 1973
Beginning in 1974 the third and fourth digits indicate the year followed by a letter indicating the month.
Note: I not used
A=Jan, B=Feb, C=Mar, Etc.

RHEEM OR RUUD
Capacity: Look for those elusive two digits in the model number (usually, but not always) divisible by 6 and divide by 12
to convert to tons.
Example: RPGC-037JA = 3 ton
Age: Four digits of serial number indicate date of manufacture where first two indicate the week and the third and
fourth are the year. In the 1960s and early `70s this was the last four digits. More recently date of manufacture
information is found closer to the middle of the serial number.
Example: xxxx1872 = 18th week of 1972

TAPPAN
Capacity: Look for those elusive two digits in the model number (usually, but not always) divisible by 6 and divide by 12
to convert to tons.
Example: CM36-11B,T = 3 ton

TRANE
Capacity: Trane has used a number of different methods for encoding capacity information in the model number. It is
commonly found in the first three digits sometimes and Btus, sometimes as tons.
Example: SPCC-B504-A = 5.0 ton, Or TWS748A = 48,000 Btu = 4 ton
Age: Through the seventies date of manufacture information is found as a number and a letter in the serial number
where the number is the single digit year and the letter indicates the month.
A=Jan, B=Feb, C=Mar, Etc. Example: 1C-xxxx = March 1971
In the early `80s Trane began to stamp the date of manufacture in the lower right hand corner of the data plate.

WHIRLPOOL
Capacity: Look for those elusive two digits (often the first two digits) in the model number (sometimes, but not always)
divisible by 6. Divide by 12 to convert to tons.
Age: Date of manufacture information is encoded in the serial number where a letter indicates the decade, first digit
year, the third and fourth digits indicate the week.
G=1970s, H=1980s Example: H43571485 = 35th week of 1984

YORK   HVAC DATING (Unitary Products since 1984)
Note: they skip the letters I, O, Q, U, Z.
Year of make indicated by 3rd letter in the serial number.
1971 – A
1972 – B
1973 – C
1974 – D
1975 – E
1976 – F
1977 – G
1978 – H
1979 – J
1980 – K
1981 – L
1982 – M
1983 – N
1984 – P
1985 – R
1986 – S
1987 – T
1988 – V
1989 – W
1990 – X
1991 – Y
1992 – A
1993 – B
1994 – C
1995 – D
1996 – E
1997 – F
1998 – G
1999 – H
2000 – J
2001 – K
2002 – L
2003 – M
2004 – N
2005 – P

YORK NEW SERIAL NUMBER — OCTOBER, 2004 TO THE PRESENT DAY

Here how to read the new serial number: W 0 E 4 298223
2nd and 4th digits 0 and 4 (number) is the year of manufacture.
To find the year of manufacture you have to combine the 2nd digits with the 4th digits.
Ex. W 0 E 4 298223 was made in 2004. W 0 E 6 298223 was made in 2006. W 1 E 0 298223 was made in 2010.
More examples: If the 2nd and 4th digits look like this: 2nd digits = 0 and the 4th digits is 5 = 2005
07 = 2007
11 = 2011

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