Our heat went out last Winter and we didn't notice it until our house was quite cold. By then, it was a Friday morning... TWO plumbers came out, neither could find or fix the problem. Finally, through a friend of a friend situation, we got this guys number and he came out early Sunday morning (by then we were freezing and quite desperate!) and fixed it within an hour. Needless to say, we love him.
The problem was caused by some bricks that fell in our chimney, blocking the heat vent. He was able to temporarily fix it so we could stay warm until we could get some chimney guys out to fix it permanently.