We found some winged ants in a windowsill of our first home. It's been a while,so I may be wrong, but I think they were carpenter ants. Fortunately we caught them before any damage was caused. We feel the same way about some of the larger pest control companies. We own a rental property and we had to find someone reliable that wouldn't talk us in to unnecessary treatments. I am not sure where you live, but we use Crown Pest Control, located in the Mid Cities area. We have used them for years and have always been happy. They have never talked us in to anything extra, the prices seem reasonable, they are on time, they back their work and best of all no pests. www.crownpestcontrol.com ###-###-####
Goood luck!