Scorpions can be difficult to deal with once they are inside the home. They can stay in an area for months without moving or eating so even with a very thorough pest service you can still see some. They tend to enter the home, go into the attic and come out through light fixtures/ceiling fans or simply gaps around doors. Here are some things that you can do to help keep them from entering in the first place.
Remove all trash, logs, boards, stones, bricks and other objects from around the structure.
Keep grass closely mowed near the structure. Prune bushes and overhanging tree branches away from the structure. Tree branches can give scorpions a path to the roof.
Store garbage containers in a frame that keeps them above ground level, if possible.
Never bring firewood inside the structure unless it is placed directly on the fire.
Install weather-stripping around loose-fitting doors and windows. If you can see light around the edges that is an entry point.
Plug weep holes in stone or brick veneer structures with aluminum window screen, it blocks access but allows the house to still breathe & sweat as needed.
Use sealant around roof eaves, pipes, and any other cracks into the structure.
Keep window screens in good repair & make sure they fit tightly in the window frame.