I also had to get rid of large quantities of hibernators around my roof this year, the populations have really exploded, I did a large massacre last summer - my garden has been so full of the creatures and I am extremely allergic to them
But you didnt wait till the cold season, did you? I guess everything succeded without turning into disaster.
We performed it a very safe way. Read about few methods but they are risky! What makes things worse, they often choose to build a nest st such a spot that is hardly to get to. I had to build sort of pedestal, a raised platform to stand at, and knocked the nest down with a shovel into a packet. And my wife held the bag open and close to the nest using two long boards. In our case, there was no risk cause the hornets were hibernating - but if it had been warm summer temperatures... the success would not have been so successful, knocking down the nest was not a simple 1-second click, alas, took me 2 minutes.
That sounds scary!
Ours are not exactly like yours, they are large and make open nests of about 20 individuals - they have a tendency to build under the roof of the house and close to doors. They become aggressive once the nest is large at the end of summer and we get rid of them by spraying the adults at night when they are sleeping and then removing and crushing the nest in the morning or the young wasps that are already pupating will hatch and continue there.
What I can say? beautiful wasps and beautiful house (from the visual side) I'd love to take photos of. But I'd also love to keep it far from my place, heh.
(Our nest also was under the roof).
The love it under the roof, warmer and sheltered. These guys are also interesting to watch as they are social insects but they become a real hazard next to the door and around passageways late in summer