If the seller has authority to sell the home and it's underwater, you may be able to pick it up at a discount.

You can A spend hours and hours on the web watching hour and a half long videos, be clueless of where to go, get sold a training that costs 5k plus (for information that you can learn on the web for free if you look hard enough, bigger pockets,crinoline, youtube, google, reitipster, ..the list goes on forever.

On the other had, if you are really talking about an HVAC or central air system, then the cost is likely far in excess of any de minimis rule and you will end up depreciating. 

Philadelphia's website: http://epay.phila-records.com/phillyepay/web/It's not free.But there's property.phila.gov as a one-stop site for pretty much everything else.

Do they have a phone contact on their web site?

Their fees are excessive (8.5% management, $13.75 for EACH service call and separate hourly and materials fees). 

A web site is nice but you could also have the information in a Google Canned Response or something.

Win for the local authorities, bigger win for the gang.

Another advantage of a pile foundation is that the structure can be built so that only the piles are in contact with the soil and the swelling and shrinkage of the clay will not affect the structure.So to answer your question on when a foundation is too bad to fix... watch out for poorly constructed concrete foundation and CMU walls with excessive vertical and horizontal cracks, doors and windows that do not open or shut...

37yrs performance on servers, 15yrs web design, 4yrs mobile design.