you can trap them and transport them, if you don't want to shoot them,

you can buy a trap for $20-30

when we had squirrel problems, it seemed you'd hear them, then go in the attic and they'd be gone.

good luck!

I think in most states you can shoot squirrels year round.

I'd seal any small holes you can find, they make that great stuff foam in a rodent formula... quick easy option,