Squirrels in the attic better than bats in the belfry!
Updated: Sep 20, 2019
Allstate article linked to image says make noise, put vinegar soaked rags in the attic, seal the opening after they leave and check for nests with babies (mom won't leave in this case and might be ornery) and damaged wiring. I recently watched a mother squirrel trying to coax a young 'un from a roof to a nearby tree. She kept jumping to the tree to demonstrate the technique. The baby was having none of it but they both were safely off the roof after the inspection: shwoo!