ancient unit, age

[Robin N. Byrd]

any help here is appreciated. i'm dealing with renting tenants & no info for this property.
I have a Janitrol unit heating & air. Appears VERY old.

heating - serial 0900T69

ac - serial K670DD0577, model 440302B

thanks for your time!! as always, it's much appreciated.

[Ian A. Niquette]

Prestons Guide for AC says 1970 or 71. Can't find info for heat unit.

[Robin N. Byrd]

thanks

just looked @ the title - should've said Ancient Age - Hmmmm........
a little of that would help the property!!