you will hear them for sure. and they will congregate in areas that are
warm this time of year. i had a bunch nesting in the area above my
light in the kitchen ceiling. heat from the light) i took out the
light, enlarged the hole and placed a step ladder under it. in less
than 1 week my cat had them wiped out. where there is 1 mouse there
could be 20 more. they breed like rabbits.