I have to ask, are you certain it is a chipmunk and not a red squirrel? Chipmunks burrow in the ground for their homes, never have had one try to get in my house or camper and I have plenty around. Red squirrels are notorious for getting into homes, neighbor had one in theirs. I had mice in the trailer for the first time last summer. Just ordered a new electronic repeller that has the sound plus strobe light to scare them. Reviews were good from people that tried everything else for mice or rats under the hood of their cars. Older ones never did much good.