If they are in the chimney it might be difficult to get them out. The queen is most certainly in there already, she will not leave her brood, are you sure they are honey bees and not yellow jackets. I used to be a beekeeper. How much room can there be? Are the getting into the stud wall behind the chimney?
Finally, I knew someone here had to have been a bee keeper.
About a month ago they were swarming around my chimney, I lit logs and they dispersed. However they moved over a couple feet to a gap in the stucco between the bricks and wall. I sprayed the heck out of them with some poison and they left. A week later some more returned to the same spot, I sprayed again and they left. Now about two weeks later some have returned again. I'm surprised at how they can be completely gone for a week or two and then return. Do you think the queen can still be in here and without assistance for a week or two? Can it be a scent left? Puzzled.