How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
How can I determine the age of a York heat pump from the serial number?
Saturday, January 11, 2020
For York heat pumps manufactured from October 2004 to the present, the first and third digits in the serial number will be letters, and the second and fourth digits will be numbers that indicate the year of manufacture. So, for example, the serial number below beginning with “W1D5” indicates that the condenser was manufactured in 2015.
An earlier serial number system, that was used until October 2004, has a sequence of four letters followed by a string of six numbers. The third letter indicates the year of manufacture but, because the letter series repeated every 21 years, some letters will require you to look at the condition of the system or find the year of any industry standard referenced in the fine print of the data plate (such as ANSI) to determine which of the two years that used the same letter it is.
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
J = 1979 or 2000 K = 1980 or 2001
L = 1981 or 2002 M = 1982 or 2003
N = 1983 or 2004 P = 1984 R = 1985
S = 1986 T = 1987 V - 1988
W = 1989 X = 1990 Y = 1992
So WDHP875237 would be either 1978 or 1999. And here’s an example below that could be 1980 or 2001 but, but we also knew that the house was built in 2001—so it is the original system.
For the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner? To determine the size of a York system in tons, see our blog post How can I tell the size in tons of a York air conditioner or heat pump from the model number?
To determine other key specs of your HVAC system, see one of these other blog posts:
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Field Guide for Home Inspectors, a quick reference for finding the age of 154 brands of HVAC systems, water heaters, and electrical panels, plus 210 code standards for site-built and manufactured homes, and the life expectancy rating of 195 home components. Available at amazon.com for $19.95.
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To learn more about heating and air conditioning systems, see these other blog posts:
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