I had Chris Wells stop by one of my Rental properties to inspect for Termites. No Termites found but he took the time to explain how Ants work and what to look for. I recommend him and this company. Inspections are free.
Also just a note. Treat the perimeter of your house every couple of months. Doing this goes a long ways toward controlling Ants and Bugs that try to get in your house during the warm months. Spray product work better than granules.