replace or repair AC for a flip

[Chris M.]

I'm doing a flip on a house and already way over budget.  The furnace definitely needs to be replaced.  I can either repair the AC for $400, or replace it for $2400.  The AC is working fine and in good condition, but its 19 yrs old.  Thoughts?  Will buyers pay $2000 more just to know that they have a new AC?