I can’t find the age of a Duo Matic/Olsen gas furnace:
Model HCS90
Serial 28716HCGNU
Thanks in advance!
I can’t find the age of a Duo Matic/Olsen gas furnace:
Model HCS90
Serial 28716HCGNU
Thanks in advance!
I would say 1987.
If you’re not missing a preprinted prefix on the serial number – which would be a letter – then it’s a 1971 unit.