This morning the house was cold. So much snow had drifted at the side of the house that the air intake and exhaust for the furnace was covered. So I opened the door which was possible because there wasn't too much drifting there. I saw peeking out through the snow on the porch a piece of plastic that turned out to be the newspaper - amazing that the news delivery person had succeeded (they did plow the street recently). I shoveled my way around the corner of the house and shoveled out the air intake and restarted the furnace. It is hot air so it warmed the house up quickly.