Graham Masterton's Charnel House is $1.99 at Amazon. I actually read this book just a few months ago. Honestly, I remember the book being pretty middle of the road, though it had a strong beginning.
A desperate and terrified old man appears at the office of John Hyatt at the San Francisco Department of Sanitation with a chilling complaint. His house, Seymour Willis insists, is breathing. Hyatt suspects a rat infestation but the truth is worse. Much worse. An ancient demon out of darkest Native American folklore lives within the walls and floorboards of Willis’s home—an all-powerful malevolent being determined to break free and wreak havoc on the City by the Bay.