How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactured and modular homes
How do I tell the age of a Fedders furnace or air conditioner from the serial number?
Sunday, August 19, 2018
Although the Fedders brand is used for window units nowadays, this encoding only applies to when they manufactured unitary (split) systems years ago. The second letter of the serial number indicates the year of manufacture (from 1966 to 1977):
A = 1966 B = 1967 C = 1968
D = 1969 E = 1970 F = 1971
G = 1972 H = 1973 I = (not used)
J = 1974 K = 1975 L = 1976 M = 1977
An ancient Fedders unit we recently inspected had the serial number AH11877, indicating that it was manufactured in 1973. The home was built in 1973, which provided a secondary verification of the manufacture date indicated by the serial number.
Also, see our blog posts Why is my air conditioner not cooling enough? and How can I find out the SEER of my air conditioner?
To find the age of other home components, go to How can I find out the age of a roof? and How do I determine the age of an electrical panel? and How do I determine the age of my water heater? For life expectancies, visit What is the average life expectancy of the components of a house?
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To learn more about heating and air conditioning systems, see these other blog posts:
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