When the mercury drops to single digits in January, and your furnace decides to quit, the cost isn't just the repair bill — it's the frozen pipes, the emergency hotel stay, and the four-hour wait for someone to make it through the snow. Furnaces almost never fail without warning. The trick is knowing what to look for and acting before the cold snap, not during it. After fifteen years of servicing furnaces across Albany, Schenectady, Troy, and the surrounding towns, we've seen