As temperatures drop, your furnace becomes one of the most important systems in your home. When it's working properly, it keeps your family warm and comfortable. When it's not, it can quickly turn into a major inconvenience or even a safety concern. Below are some of the most common furnace problems, what causes them, and how regular maintenance can help prevent breakdowns. Dirty or Clogged Air Filters One of the most common furnace issues is a dirty air filter. When filters