Today we had an un-February-like temperature of 72 degrees. It was also the day our furnace went on the blink. My husband, who has excellent hearing, noticed the fan sounded "different." Why he had the furnace on with the outside temp being springy, I will never know.
No air was coming out of the vents. I made a call to the wonderful heating company we use here and they agreed to send someone between 2 and 4. He was here at five after 4 and at 5 we had a new switch and an operating furnace.
Tonight's forecast is 25 degrees so we need that rotating fan to blow warm air.