Man; that bites the big one I hate escapees.. I have not had one in awhile (well, my BCI escaped a few months ago and woke me and my honey up by knocking my prized porcelain horse off of a shelf and breaking it.. ::blushes::
But yes, I would think like your snake. Look under and inside the parts of endtables, coffeetables, bookcases, in drawers.. under sofas or chairs and allll inside them (you don't want to look not-deep enough and miss your snake being coiled up in there..)
I have been there and did lose one snake's life when she got into the basement and died, years ago. It is tough and yes it happens from time to time. I hope that you find your escapee..!
I would also keep outside doors and windows closed, and tell people that you live with to make sure they stay closed. Any doors with openings at the bottom (like my stupid front door) should be closed as well. And maybe block off any open heating vents/grates with large holes if any.. maybe plug up the drains in your bathroom (but make sure that the faucets are off!)