I have a log home. I also have carpenter bees. I also have a tennis racket.
Each spring I practice my tennis swing outside.
There are 77 dead carpenter bees littering my property now.
Should nab another 10 today.
I've been waging war against carpenter bees for several years now. They seem immune to spray. My latest weapon is an electrified tennis racket looking thing I found at Lowes.
Bumblebees nest in the ground. Carpenter bees nest in wood - they seem to like decks. They don't eat the wood so if you plug their holes over night, they won't be able to escape. However, I used duct tape over a hole last year and wouldn't you know it - someone staged a rescue and bored into the tape from the outside!
Carpenter bees are very aggressive but they don't sting. So you can get up face to face with them and whack them with a tennis racket. Their main defense is that they look like bumble bees. I've also read that they don't contribute much to pollination. So whack away!
I gave my self tennis elbow doing that one year. The new electric tennis rackets are pretty fun on those things too.