Diatomaceous earth for the crawlers.
What do you do? Just put a 1" layer around the perimeter of the house?
Currently I am spraying x2/yr with a 2 to 1 ratio of Demon WP.
Just be sure that the diatomaceous earth you use is food grade - not the kind that goes in swimming pool filters. The pool type has been chemically altered and may contain carcinogins and is therefore not safe around pets.
Go to Costco and get some dish soap. Pour it around the perimeter of your house and edges of all your walkways. Use some water to get it to soak into the dirt and cracks. No more ants after a few weeks.