You want to seal any openings after they leave. They can squeeze
through as little as a quarter inch opening. After they go out at
night, string lights in attic to keep from returning and do your sealing
with screen, insulation, caulk etc. Bats are generally beneficial but
sometimes rabid so you have to protect yourself because if scratched you
will need rabies shots.
Not sure if lights would really be a deterrent.
When I was a young lad at Boy Scout Camp we used to go down to the
lake at night and shine our flashlights up towards the bats that
always hung out over the lake. They would begin to circle, flying
closer and closer to our flashlights each time they came around. It
was only the bravest of us who would remain stationary until the bats
actually hit our flashlights with their wings.
Second that, you do want bats around since they eat a whole lot of
mosquitos and other nuscience bugs. Bats are also rarely rabid and
rarely associated with diseases, it is the rare cases where they are
that get the attention of course.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.