During the breeding season, some bees will leave their old nests and go out to find new places to settle down. The windowsill of residents' homes meets the requirements of bees to choose nesting sites because of its cool ventilation, making it easy for wasps to fly into their homes.
There may be a beehive at home, so you can find it in the place where wasps are easy to nest at home.
Hungry wasps flew around and accidentally flew home. You can check windows, screens and other places where insects are easy to fly in.