Well, I don't think there's anything illegal about putting a custom version of the standard farmer's electric fence around the AC unit. Go ahead and build a chain link "cage", and just put the battery and electric fence portion on the inside of the cage but connected to it--it's not lethal, but I'm sure it'd be a pain for the thieves to get through.
Some people are not worth the wasted air they breath!
Another reason I refused to rent out any of the 3 houses I sold. I would have burnt them down first.
Well it's a good thing these were purchased for the express purpose of renting them out then isn't it, so I wouldn't have to make that difficult choice. I am not a landlord out of desperation or circumstance but choice. It is my 401K and hubby's FU money.