Operation Stink Bug...
Our house gets hit pretty hard with stink bugs in late Sep through Oct. Some days there can be 50 on the sunny side of the house at a time, clustering around the screens. They are TENACIOUS, and once they find a chink in the armor (so to speak), they exploit it and bring a parade of buddies with them. MOST IMPORTANT is to completely seal access via windows and doors. They can squeeze through tiny cracks.
Second front in the war (and this works best with a slightly OCD/sadistic attitude)... You hunt and kill them. We're at least lucky enough to live in a ranch, where we have access to the areas where they most congregate. I use a plastic Folgers coffee container filled with a little water and soap suds. Like previous posters claim, stink bugs are among the easiest to catch (THANKFULLY!!!!), as their natural defense is to "drop and roll"... I just hold a container under where they sit, and 'coax' them with a fly swatter... they drop and drown. We've added the hunt and destroy routine to our (many) fall yard work tasks...just a fact of life. Am I making a dent? Don't know, but hopefully I'm minimizing the numbers I have to chase down INSIDE my home over the winter. I have YET to eradicate them completely, but I can assure you, IF I DIDN'T DO what I'm doing, our problem would be MUCH WORSE. It's a learning process... I feel I'm getting better at it each year.
Third front is to accept that at least a few WILL likely breach your defenses... Doors for example... The CAN and WILL exploit door cracks, since it's virtually impossible to completely seal these. You'll find them hidden on the hinge side of the storm doors when you open them; just knock em down and gather or crush them... the smell isn't SO SO bad... just annoying, and it WILL dissipate.
Once inside, stink bugs will eventually be attracted to your indoor lights, and we sometimes hear them buzzing around our living room, where we quickly hone in on their location, waiting for them to land on a surface before removing them. You get much better at catching them over time. It's no big deal.
Someone mentioned Spotted Lantern Fly... we're STARTING to see them... they're a whole nuther challenge... BUT, like the stink bug, they have a similar (albeit more challenging) defense mechanism that helps to catch them. They SPRING straight back at you (with great force) when alarmed. I use an old plastic apple juice container with a big hole cut on the side. Filled with a little water and soap, it serves the same purpose. You approach directly from behind the lantern fly, and press the hole around them. They will snap back and fall into the drink. Easy peasy.
It IS work to hunt and kill them... and I've got plenty of other jobs to do... but still, when they attack by the thousands over several weeks, taking a few minutes each day to eliminate 100-200 is my way of taking the fight to them.
GO GET EM!!!