Determining Cap Exp for a 24 year old House in Kansas City, MO

[Mariama R.]

What is the typical Cap Ex on a 24 year old duplex house, in Kansas City, MO which is between 1000 sq ft and 2000 sq ft, wherein one AC electric unit is new, the other one is 8 years old, where the heating systems in the 2 units are 8 years old and where the ages of the water heater and roof are undisclosed?  Would you estimate between $100 to $200 per month in expenses? Thank you.