Stink bug infestation
Hello, The stink bugs that you are encountering are likely the newly introduced Brown Marmorated Stink Bug. To help ID the bugs, we have a factsheet available.http://cru.cahe.wsu.edu/CEPublications/FS079E/FS079E.pdf
Every year, the adult bugs will enter the winter by creating aggregations and often choose to overwinter along the south sides of light colored houses. If they are able to gain access through the screened vents, it would be advisable to change the screen size in the vents. Note however, that the adults can access very small spaces.
Once inside, they will aggregate in attic and wall voids. Some will orient towards the inside of the house and those are the ones you see in your living room. Indoor light traps (either purchased or made) can help catch these individuals.
Insecticides can be used on the exterior of the house. Vacuums are best for removing the insects that are with in reach during the fall and continue to use the vacuum for those that get inside.
To learn more about the stink bug problem in the Pacific Northwest, visit: