After they left for the season, I took out the gable vent, attached screening to the outside, and made it impossible to get back in. This seems to have worked fine.
I'm about to have my house vinyl sided and I'm thinking of having the gable vent closed up with plywood and siding over it. I really do want to deal with bats or other critters getting in.
My house is 12 years old. I have soffit vents, ridge vent, and a power temp controlled roof vent (I had that put in when I had central air installed).
Many/most of the similiar homes in my neighborhood do not have gable vents. Does it sound like I have adequate ventilation in the attic if I remove the gable vent? There is no gable vent on the opposite gable (chimney on that side).