Can you stack bales of hay/straw around the coop to insulate the noise?
Do you know if there are certain times of the day that they are bothered most? If its early morning, perhaps just letting them out later would be an option?
I was thinking about adding some insulation. I think blocking off the two big windows will help. I like having the ventilation but oh well. They are usually not too loud in the morning but the run is secure so I have been leaving the pop doors open 24/7 all summer. So maybe I should start closing those at night again and letting out around 8. hopefully they won't get mad and make more noise! . But really they are most noisy when they lay which is usually mid morning to mid afternoon. What I really want to do is pick up and move out to a more rural area but that won't be happening any time soon with our house under water.