I think what you are seeing trying to invade you house is actually Brown Marmorated Stink Bug. The reason you have not had them in the past is because they are not native to USA and invasive. See the government article below. Prevention is the best plan as once they are there for the season... they will be there all season. I have had some luck with dryer/bounce sheets between the window and screens. Best of luck with Stink bugs. invasivespeciesinfo.gov- then search brown marmorated stink bug
I think what you are seeing trying to invade you house is actually Brown Marmorated Stink Bug. The reason you have not had them in the past is because they are not native to USA and invasive. See the government article below. Prevention is the best plan as once they are there for the season... they will be there all season. I have had some luck with dryer/bounce sheets between the window and screens. Best of luck with Stink bugs. invasivespeciesinfo.gov- then search brown marmorated stink bug