By replaced I mean new handler/condenser, not sure if the ducts are original or not.

And yes I'm the crazy one that replaces A/C condensers in November (when they're getting old) to avoid the expense in spring at the same time as taxes are due.

Once, I had a tenant  install a window AC improperly so that the condensation dripped into the window sill and inside the house. 

However, on our first SFR, we chose not to replace a visibly aged A/C condenser, so as a hedge, we did pay the $385 to get a warranty for the first year.

I taped some instructions to the air handler about changing the filter and putting bleach down the condensate tube to prevent backups.

(EDIT: For the truly bored and attentive to detail, I took the liberty of condensing Jacob's post.)Jacob - take the $3000 hit on the chin and accept that this guy is a lousy small business owner who has engaged in terrible fiscal practices and has dug himself into a deep, dark pit... which is probably a lot worse than he's letting on.

So, once I go under contract, I then immediately schedule my inspections which include roof inspection, plumber (check sewer lines and fresh water lines), HVAC (check AC condensers, heating units, boilers and chillers - if applicable), and if anything looks suspect, a foundation expert.

So your never going to go into neighborhoods that have burn outs board ups and barred windows and caged condenser units... and those things can extend into mid price in the mid west as well at least the caging the condenser units..

I know there needs to be an air conditioner condenser unit replaced, I also need an electrician.You are absolutely right about my learning a lot from this one.

For example, the windows are the original single pane - some are hard to open, in winter the some of the storm windows get condensation, but I don't think I'd want to replace ~20 windows.