What kind of structure are you dealing with single family home ,block or row house. Exclusion prevention are key in controlling rodent problems.Mice on the main floor mean mice in the attic. #1 entry point garage installation of bait stations glue traps or snaps offer a first line of defence...

I would stay away from whirly-bird and install maximum vents they run about a 100.00 a piece and vent aprox 800 sq feet and most important are bird,squirrel,mouse,raccoon,and bat proof.We install for about 150.00 each depending on assess pitch of roof etc.