I do DE in the coop, which helps some, but I still had some flies and insects around. I hung a sticky trap from the ceiling in a corner near the food and also bought a small package of cedar bedding that I threw in with the pine bedding. I know there is debate out there about cedar bedding, but it's a small amount, not overwhelming, and helped immensely. Last fall, I also hung bundles of basil in their coop - I learned that trick at a restaurant that had cups of dried basil on each table to keep flies away. I am late getting my basil going this year, so when its ready I will put some of that in there too. I also try to add a little fresh bedding every couple days, at least in soiled areas. Hope this helps!