HOUSING INDUSTRY RESEARCH CENTER

Keeprite – How to determine the age or manufacture date

Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of HVAC equipment.  Anytime anyone is dealing with numbers and letters in determining data, mistakes and misinterpretation are bound to happen.  For this reason if you find during your research that we may have erred please contact us.  In addition perhaps you have come across a brand, model or serial number format that we have not addressed.  Email us information or pictures of data/nomenclature plates of the unit and we will attempt to assist you in your determinations.  Email

This page was last updated:  26 July 2009

There are at least three styles of serial numbers used by Keeprite.

Style 1

Keeprite – (1994 to present)

Serial Number format:  L9447 37886

(This serial number is from another furnace with a similar serial number format).

Date of Manufacture:  Using the second, third, fourth and fifth digits of the serial number L9447 37886 you will find the year and week of manufacture.  The second and third digits are the year of manufacture and the fourth and fifth digits are the week.  This unit was manufactured in the 47^th week of 1994.

Week of manufacture:  L9447  37886

Year of manufacture:  L9447 37886

Keeprite – (1980 thru 1993)

Serial Number format:  305123456

(This serial number is fictitious).

Date of Manufacture:  Using the first, second and third digits of the serial number 305123456 you will find the year and week of manufacture.  The first digit is the year of manufacture and the second and third digits are the week.  This unit was manufactured in the 5^th week of either 1983 or 1993.

Year of manufacture:  305123456

Week of manufacture:  305123456

Keeprite – (1970 thru 1994)

Serial Number format:  Z3Z xxxx or ZZ xxxx

(These serial numbers are fictitious).

Date of Manufacture:  Using the first group of digits use the last letter to determine year of manufacture.  Both of these sample serial numbers indicate that the unit was manufactured in 1977.

Year of manufacture:  Z3Z xxxx or ZZ xxxx

Use this chart to determine 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