There's no bugs, I spray more than regularly. However the siding is masonite (old house), and I think they like the soft wood to try and find a winter home. Birdshot has already crossed my mind, but I live in the city limits...risky although I would probably get away with it. I might just have to bite the bullet and re-side the house because of this. Been here 12 years, never seen one until this spring.
They are probably not eating the house. In the Fall, they will bang on the wood to establish their territory, leaving small holes. Definitely a nuisance. They will usually stay in one area at a time. You can try hanging foil strips or small wind chimes in that area to scare them away. Or, you can run out there like a wild man and try to scare them that way (works for me). :1287: