Not with poison, don't want it dying in your bedroom wall. I'd set out some rat traps under the house.
And if you set traps in the heating ducts tie em off with a piece of wire so you can reel em in.
My neighbor learned that the hard way.
Edit.....he's disabled so his wife actually learned that the hard way.
He said she wasn't the least bit happy when she came up out of that crawl space.
