We had one wasp nest under a porch and several yellowjackets nests where they had got inside the exterior walls through light fixtures. The technician was very knowledgeable and patiently explained all aspects of the pest treatments. He also gave us good guidance on what to look for in case the yellowjackets weren't eliminated with the first treatment. When a few returned a couple days later, he promptly came back and treated them with no additional charge. We have had no problems since.