Need help determining Age of HVAC All-In-One Units

[pcarter-old-04]

I need to know where to find or told how to determine the age of the following All-In-One HVAC Rooftop Units. Any help would be appreciated.

Thanks

1. York - Model#: 03CG090N13025E ; S/N: NDCM032780
2. York - Model#: 02CG120N200258 ; S/N: Unknown could not read MFG tag
3. York - Model#: 03CG090N16525C ; S/N: NEBM031888
4. Comfort Maker - Model#: PG8090H2HA; S/N: L970574154

[apolillo]

Originally Posted by pcarter

I need to know where to find or told how to determine the age of the following All-In-One HVAC Rooftop Units. Any help would be appreciated.

Thanks

1. York - Model#: 03CG090N13025E ; S/N: NDCM032780

1994 Or 1973

2. York - Model#: 02CG120N200258 ; S/N: Unknown could not read MFG tag
can't help

3. York - Model#: 03CG090N16525C ; S/N: NEBM031888
1993 or 1972

4. Comfort Maker - Model#: PG8090H2HA; S/N: L970574154
1997

hope this helps

Anatol