Yeah, they do get around. I have a piece of pleather (the type used on cheap couches) over the door, hung on 3 sides by velcro strips. No way to velcro the bottom. They find their way out under the make shift door from time to time & migrate to my rooting station near the door.

If you don't have solid walls, they will get around a lot faster. But if you spray them with sweet water every night at lights out, that slows them down a lot. They don't really like to walk long distances, and to a Lady Bug, 20 feet is a very long distance.

The sweet water makes their wings sticky and they can't get them open for a couple of days.

Mites & Thrips are bad in this state. When I first started I got spider mites, broad mites, and fungus gnats all at the same time while there was over a ft of snow on the ground. Taught me real quick to get screens or filters on the intake & exhaust. The lady bugs took care of 2 of them for me leaving me with the Broad Mites to get rid of, and it took forever, until I found out about petroleum, the only stuff that kills the eggs. After that it wasn't hard getting rid of them, but they were still a pain.

I can't stress the importance of screens enough, and changing your clothers after coming in from the outside & before coming in contact with your plants. Since I started to that I haven't seen hide nor hair of any pests, but I still keep the lady bugs around just in case.