Terminix will for sure diagnose termites. I cannot stand that company for how their Deer Park location treated us....they set out to rip us off from the moment they took over the exterminating company we used for many years. As soon as I recognized what they were doing I fired them, they wouldn't accept my firing, even though we were moving - hand closed on the house the day before...they still sent their man out to exterminate and tried to bill us. I've heard the same about the other big box companies like that.  Better to find a small operator who is honest.
@TexasOma: it was terminix that was busted for fraud in their extermination jobs. they are the company that was not really drilling thru slabs but just doing cosmetic holes deep enough to have to patch so they could charge you for a complete treatment
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