I used to live in bug paradise, Stillwater, Oklahoma. I came up with the following solution for my garage door screens.
I found some screen in a 6 foot by 50' roll. I cut it into pices to fit the width of the doors. So I had an 18' by 6' piece, and then a 9' by 6' piece for two doors. I stapled the pieces to my garage door near the bottom, and then rolled the bottom of the strips over 1/2" pvc pipe painted with rubber cement. I rigged up some thing nylon rope and a couple of pulleys so it worked like a roman shade, and rolled up on the bottom of the door.
I would open the doors to about five feet or so, roll down the screens, and call it good. the sides were not sealed, but they did rest against the door tracks. So I had pretty good ventilation, and a lot less bugs. The only draw back is getting the bugs off the screen before you roll it up....