If you have vents leading into an attic, they love to build nests inside. From there, they will find passages into your house from ceilings, so in addition to what Rusty advised, check there as well. If by chance you see them entering though the common 1/4" square galvanized screen, you could apply a bit of Raid Wasp Spray into the screen area, which will cause them to look for a better home. Be careful, as some will actually attack if advanced on, so keep a can of long shot spray with you, and get them before they get you. Those little buggers can cause a sting that hurts like a b****!
|