York Heat Pump Age

Serial # W0G6622577 Can anyone help?? Thanks…

York age is determined by the 3rd letter in the serial number. G is either 1977 or 1998. What is the house age?

Joe,The house is over 40. The unit looks relatively new. I dont understand how you derived those 2 years from “G”. Can you explain? Thanks…

Check out this thread. Age codes deciphering help is there for many types of units.

http://www.nachi.org/forum/showthread.php?t=174

Thanks…