How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactured and modular homes
How can I determine the age of an American Standard furnace from the serial number?
Sunday, January 12, 2020
There are two serial number formats:
1) 2002 to present - If the serial number is a 9-digit combination of letters and numbers that starts with a number, then the first number is the year. Beginning in 2010, the first two digits are the year. Examples of each type are shown below. Many units have the date of manufacture stated below the serial number.
2) 1983 to 2001 - If the serial number starts with a letter, then that is the encoded year. W = 83, X = 84, Y = 85, S = 86, B = 87, C = 88, D = 89, E = 90, F = 91, G = 92, H = 93, J = 94, K = 95, L = 96, M = 97, N = 98, P = 99, R = 00, Z = 01. So the serial number shown below indicates that the furnace was manufactured in 1992. Notice that the year that the letter indicates is corroborated by the 1990 year of the ANSI rating above it, which should be the same year or just a few years earlier.
Many, but not all, furnace data plates will also state the month and year of manufacture somewhere on the data plate, like the examples below.
To determine the age of a American Standard air conditioner or heat pump, go to our blog post How can I determine the age of an American Standard air conditioner or heat pump from the serial number?
To determine other key specs of your HVAC system, see one of these other blog posts:
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
To learn more about heating and air conditioning systems, see these other blog posts:
of Blog Posts
Top 5 results given instantly.
Click on magnifying glass
for all search results.
Buying a home in North/Central Florida? for a team inspection by two FL-licensed contractors and inspectors. Over 8,500 inspections completed in 20+ years. In a hurry? We will get it done for you.