Well, I'd say it's neither the green light to great days to come nor the warning sirens of impending doom, that it's just and only exactly what it is, a singular point of a handful of data points.     

You always have the option of walking away.My recommended course of action is that you extend the contract so that you get YOUR OWN hvac guy can get out to take a look.Your hvac guy won't mind the quick and easy job of diagnosis, give him an hour or two of work, have him write up a lightly padded repair estimate and hand that over to the seller and ask for that amount to be credited.

There was a time in my 20's that I enjoyed being near all of the lights, sirens, and and amenities that a major metro provides but as you age you start to understand that it's really over rated.I grew up in small town Kansas and have lived in some big cities after I graduated college.

i've done them a bunch of different ways - i'm finishing up a BRRRR now where I borrowed 90% of the purchase, and then just paid cash for the rehab because it was pretty light. 

The stories of the best deals come from those who were persistent and consistent in door-knocking and driving for dollars.

The dollars for the light renovations would be the only money you'd pay to us directly.

Step in to a bright and airy living room with large windows that allow natural light to flood in.

If often more that they are abandanoning the property to the government because there is some type of constraint, i.e. there is a street light oddly placed in the middle front part of the parcel, there is a creek or wash (which means environmental permits would be needed), there is lack of true legal access, zoning problems, etc. 

It still needs a light Reno.

Of course how you handle this you must tread lightly.