Quote Originally Posted by bmccasland View Post
The squirrels are trying to stay warm and dry during the winter. So once you trap them, their access holes will need to be blocked (the chewed window frames). Might try nailing hardware cloth (heavy metal mesh) with lots of overlap over the holes.

And are you sure there's just one? Hopefully your squirrel buddy doesn't have a wife and kids up there.
The hardware cloth sounds like a good idea--someone else suggested that as well. As for there possibly being a squirrel family up there, hopefully not! Someone I talked to yesterday said this is their mating season and they could start having babies in a few weeks, so there probably wouldn't be any yet. We just need to get it out before that does happen!