Need age for Armstrong furnace and a/c

Specific Inspection Topics Inspecting HVAC Systems
1

Hi guys, I am having some trouble finding an age for these units.

Ser # 1605D03420 --furnace

Ser # 1605C00835 – A/C unit

Thanks in advance!

2

I think I figured it out. March of 2005. Right?

3

I believe you’re right, Richard.