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The "stink" in stinkbug refers to the insect's scent glands that release a foul odor as a defense and when they are squashed. Although they are present throughout the spring, summer and fall, it's in the early fall when they begin to come into buildings looking for a warm, protected place to overwinter. They may also be seen in large numbers on the side of a building in the warm sun.
Stinkbugs are not known to cause harm to humans and don't reproduce or cause damage while inside a building. However, it can be distressing to have large number of them flying around inside, not to mention a bit smelly if they are squashed.
The best way to deal with stinkbugs is to prevent them from coming into the building in the first place. Practice integrated pest management (IPM) when dealing with stinkbugs.
Prevention: Inspect the building
Management: If stink bugs enter the building