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Are you worried about them going through your stuff? stealing your stuff? etc.
I've seen some repairman being pretty careless and oblivious about leaving doors open, etc. while working on units. And I could see someone easily walking in and grabbing valuables while they're distracted.
Get a hidden camera! My new solution to everything...; )
You can buy pretty good quality and make your own for only $129.
addendum: as a clean person, I notice how much dirt/grime repairman can track through, too. I understand the inconvenience.