Here is an interesting innovation in pest control. Our builder has installed small distribution tubes in the walls, that can be used by the pest control company to spray for bugs. Seen below, the system consists of the thin green lines, looped near the white sewer lines. The lines have small perforations, so when spray is injected, the lines evenly spray the chemicals inside the walls.
The lines are installed along all the exterior walls and interior portions where there is plumbing. Obviously, these are best installed during new construction, prior to dry-in.
The pest service technician does not even need access to the interior of the house to spray. The lines all converge at a central location where they are connected to exterior ports, which are secured and accessible to a technician outside the home.
Here is a picture of the port box on the outside of the home.
Taexx system details can be found at this website https://pestdefense.com/faqs/