You probably have a nest hiding somewhere. Wasps make nests in our telephone cable cases up in the air all the time. We have to be onguard during the summer. During the winter, they are comotose just like you are describing. But they can still wake up and get mean. I hate them too!!!

If I were you, I'd get your house super cold so that you know they're comotose, locate the nest and have someone (if you don't have the stomach for it) kill them.