ltilton:

You could definitely keep out some insects and all the vermin. I lose 100% of many things to birds and raccoon oudoors. You would also be more or less protected from hail and wind, no small matters around here.

My greenhouse protects from all except aphids, grape leaf hopper, and spider mites. In fact I don't have spider mite outside but they are my only serious problem in the greenhouse growing all kinds of fruit.

You might not be protected from some insects depending on screen size. I think this would work great against that new stink bug but not the spotted wing fruit fly.