Age of ARCOAIRE furnace

I need help with the age of a ARCOAIRE furnace, model # GNE100FHA1. I can not find anything in PRESTON’S

Thanks for the help

That was a brand I installed once upon a time. The GNE (same as NNE) was made in 94 and 95.

THANKS! Do happen to know the age of a UNITARY PRODUCTS GROUP A/C, serial # WFG126637, model # HBBA-FO36SD.

I can not find anything today!!!

Thanks for the help!!!

1977 or 1998