Another remover used a thermal camera and determined his (FALSE) reading indicated the bees were in the wall. He/She was picking up ambient heat from a leak. It made no sense they would be there. Another example of how our knowledge of bee biology and behavior tells us more about where bees could and should be.. not fancy tools. Sure, we use the tools, but primarily to assist us in confirming what we expect. And the home owners do enjoy cool tools!