I stumbled upon this cool article on keeping bees away, you might find it helpful mklibrary.com. Sorry to hear about the bumble bee situation under your roof.
From your description, it sounds like they're white-tailed bumble bees, pretty common nesters. I'd suggest reaching out to a local beekeeping association for advice; they might have experts who can help with relocation. In the meantime, sealing potential entry points could prevent them from...