Good morning, today I completed your once time service call for yellow jackets getting behind the siding near the fire place. I did inspect the interior rooms where you were seeing some activity. I believe the ones inside came through the lighting fixtures. I treated the outside area of concern with a liquid solution. Please give the solution 3-5 days to see the best results. You do have a 30 day warranty with this service as we discussed so please call us back if the issue continues after the 5 days. If you have any general pest issues or concerns in the future, please feel free to contact our office. Thank you for choosing Green Pest Solutions and I hope you enjoy the rest of your day!