Setting aside cash for capex

[Stephen Brown]

Hey BP quick question,

When setting aside money for capital expenditures, how much would you vary based on age of certain expenditures? For example, a house that needs a roof in 10 years vs. 5 years and HVAC in 8 years vs. 2 years.

I'm just throwing numbers out there but would I do something like this?

$75/mth roof, $50 hvac/mth

vs.

$50/mth roof, $25 hvac/mth

Thanks for the help!