We have been fortunate (or lucky), as I am only aware of two (2) HVAC units 'vanishing' from a SFD that was vacant. That was about 2 years back, and there's thought that they were 'repossesed' by an unpaid person.
We had a few instances of copper plumbing thefts, and recently 600KCMil copper.
BTW, we do not have a Mechanical Inspector. It goes to Elec (wiring & OCP), Plumb for condensate & gas piping, Fire for flue/PVC venting, & Bldg for ductwork. I know that having to 'wait' for four (4) possible inspectors may sound crazy, but that's how it is.
