As we're almost on the beach, we don't get many house flies or bluebottles, they don't seem to like the sea air or the stiff breezes here.
We do, however, get nasty, tiny sand flies, and the b*****s bite! We have mesh screens on the doors and windows which keep most of them out. I also have a lot of citronella candles on window ledges, they keep all kinds of midge like creatures away!
Just a tip, if any of you are thinking of putting mesh over open windows, buy black mesh, it sounds daft, but white mesh shows up from outside, black is almost invisible!
Any bigger flies that get in get frazzled with my 'zapper' raquet, it's great fun....for me, not much fun for the flies!