Just used him on a duplex and he put up a metal roof for cheaper than shingles  

@Daniel Townsend we nearly opened one 2 years ago based in the fact we store our 5th wheel in a covered back in metal building.

OR just go with a metal pot?

We found our metal survey markers with a metal detector and was able to determined that our retaining wall belonged to us.

We were planning on replacing it with a metal roof right before we sell it in about 5 years anyway.

(they are the same) They use heavier duty parts, they were the first to use all aluminum evap coils, they have low pressure sensors/switches to protect your unit, they have been innovating more efficient motors, blower housings, electronics beyond other brands. 

The property is wooded and littered with scrap metal, machinery, vehicles and various junk.

He also kept trying to put words in their mouths, claiming there was mold in the central air unit, but there was nothing more than filthy looking coils that an AC tech company cleaned out.The PM is placing it in writing this morning that he requested all of his money back, we offered all of his money back, and he's refusing to leave.

I believe my place has metal studs, so I guess I need to look into heavy drywall anchors.  

You could also install 3/4 plywood or kitchen metal (usually seen in commercial projects).