The thermal cam registered elevated moisture readings through out the property with humidity levels in the 50-60% range."

If you install during the hotter season you risk the floor most likely gapping and coming apart during the winter or buckling during the inverse.If you are set on some type of hard surface flooring a dehumidifier could help reduce some of the risk for the time being, since changes in humidity and moisture are actually what cause expansion and contraction not temperature, they usually are just tied hand in hand.The larger the room the more the floor will move.

It's 1200sq ft (probably more because it certainly didn't feel like 1200 sq ft when we looked around) sold as-is with special warranty deed and on the surface there are very little cosmectic problems with the house except for the carpet and walls and one moisture damaged window.

Often this is causedby years of settling....the "piers" that hold up the floor have failed or moisture andwater damage have made the floor joist sag!...

This is caused by the combination of moisture and a substrait for growth.

But at the same time scary here some of the issues:-Wiring/Electric issues: there were double taps and too small cables used-Standing water in half of the backyard (every time it rains harder according to the tenants)-One of the AC units is from 2003-AC air ducts are moldy-AC pipe in addict are crushed, insulation broken, taped with lots of air leaving-No drip pan and turn off switch for airhandler (2001) in one unit-Too little insulation-Moisture in the addict-Missing firewalls between the two units-One unit has copper pluming the other unit has recently received PEX, but where the wall was cut open to replace plumbing has not been closed and you can see lots of mold, mice droppings -One of the water heaters is sitting in water and mold on PVC and is rusting and leaking.

@Eric CreagerI dont know of a specific resource but in general you want to look at the big ticket items first.Foundation - cracks, settling, moisture (basements)Roof - age remaining life, condition- missing shingles, leaks improper valleys and flashing Hvac -age useful life left.

Moisture invasion is a major issue (ie the longer you wait the more it costs) and roofs are not cheap.Get a roofing contractor to tell you if you can get a 5 year cert. 

There is moisture in the crawl space, though, that needs to be addressed, and that is the one area where some negotiating may come up, so wondering if she is getting her ducks in a row for that? 

I go to my chiropractor and there building is old but not mold issues at all.Did the mold company take a moisture meter to the walls?