Mike,
An excellent post, and for you, a prudent business decision. I do check the amperage draw on AC units. I also use an infared thermometer when looking at the an electrical panel. It takes a couple of minutes (maybe), but could save someone's life. I follow-up with an amp probe where one is a lot hotter than the next. Again, for me, its a good thing to do, and my clients believe (and they're right) that I care about their safety.
It does exceed the
SOP, though, and I also do not advertise it, or even report it unless I see a problem.