We've never been stung, but our dog was stung on his foot when he was a pup:-(
We've lived here for almost 12 years and have never been able to determine "how/where" they're getting in.
Remove all objects from around the foundation of the house.Good luck!Prune overhanging tree branches away from the house.
Dont store firewood inside the house and check for scorpions before bringing it inside.
Install weatherstripping around doors and windows.
Caulk around roof eaves, pipes, and any other cracks that might allow entrance.
Make sure window screens fit tightly in the window frame.
Fix any water leaks in the house and don't leave standing water (e.g. dog bowl) as they usually come in after water. With our drought here in Texas, I expect to see many scorpions this summer.