We had our first treatment, which was inside and outside our house. Although we have a few flies and a couple fruit flies or gnats since then, they for sure flew in a door or window. Since the treatment - which is safe for our 9-week-old puppy - we have not had a recurrence of any spiders, beetles or other bugs in the house. My family has been using Holistic Pest Solutions on our farm in Louisa County for a couple years. So, I know they are trustworthy, will come for in-between visit if requested/as needed, and the quarterly schedule will probably be all we need for our house in our neighborhood.