I lived in the country of Northern MN,and I tell you these things are unstopable.They were horrible mainly towards the fall when they ran out of food.Our front porch used to be covered,the sceern door at most times was not visible.Trying to get in dozens would come inside with you,then with the windows open and such when winter would come they got caught inside btween the storm and main window,think they'd die at -35 below hell no spring would come an theyd wake up and start flying around.My point is that no matter what you do they will never leave.
Ive heard that they were brought over to kill the insects that eat crops,and that these asian bugs do not kill the plants are meat eaters,and yes I belive it they hurt when they bite so make sure kids have bug spray on when going outside.

We live in central Wisconsin, and have the same problem, however we have the addition of boxelder bugs also. They cover the south side of our house in fall, as well as are in all of the bushes, etc. We have resorted to vacuuming them up with our shop vac. This works better than anything else we have tried. We then dump them in our fire pit and burn them. I hate to do this, but have not found any other method that eliminates them. I called our county agent - who sent me to the store to purchase diazinon, however it did not help. We mixed it as directed, but had no success. If anyone comes up with a sure fire way of eliminating them, I would love to hear from them!

We get them in Northern IL. Soapy water seems to work wonders on them. They have something on them that prevents bug spray from doing anything to them, but the soapy water eliminates that. Dont ask, all I know is it worked. I sprayed them with a bottle of dawn and water and they all fell off and died. They stink too when you crush tehm and the cats dont like them either.