There are two different serial number formats for Unitary Products. Up until 2004, the third letter of the serial number was used to denote year of manufacture by the letter code below:

A = 1971, 1992.   B = 1972, 1993
C = 1973, 1994.   D = 1974, 1995
E = 1975, 1996.   F = 1976, 1997
G = 1977, 1998.   H = 1978, 1999
J = 1979, 2000.   K = 1980, 2001
L = 1981, 2002    M = 1982, 2003
N = 1983, 2004    P = 1984
R = 1985    S = 1986    T = 1987
V = 1988.   W = 1989.   X = 1990
Y = 1991

    So the serial number below indicates that it was manufactured in 1996, based on condition of the unit.

From 2004 to the present, the first two numbers in the serial number, located at the second and fourth characters, are the year of manufacture. So this serial number shows that it was manufactured in 2009.

    To determine the size in tons of a Unitary Products system, see our blog post How many tons is my Unitary Products air conditioner or heat pump? For the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner? 

• • • • • • • • • • • • • • • • • • • • • 
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.
• • • • • • • • • • • • • • • • • • • • • • 

   To learn more about heating and air conditioning systems, see these other blog posts:

• How can I find out the SEER of my air conditioner? • My air conditioner won't turn on. What's wrong? 

• How can I find out the size of my air conditioner? 

• How can I find out the age of my air conditioner or furnace?

• How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump? 

• Where is the air filter for my central air conditioner and furnace? I can’t find it? 

• Does an old air conditioner use more electricity as it ages? 

• How did homes stay cool in Florida before air conditioning?

• What is wrong with an air conditioner when the air flow out of the vents is low?

• Why has the thermostat screen gone blank? 

• Why does it take so long to cool a house when an air conditioner has been off for a while? 

• Why is my air conditioner not cooling enough? 

• What are the most common problems with wall/window air conditioners?  

• Will closing doors reduce my heating and cooling costs? 

    Visit our HEATING AND AIR CONDITIONING page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.