How do you know if your furnace is bad?

Signs may be frequent headaches, a burning feeling in nose or eyes, nausea, disorientation, flu-like symptoms. If you experience any of these symptoms, air out your house, open a window to the furnace room and immediately call a gas service technician.Click to see full answer. Regarding this, how do I know if my furnace needs to be replaced? 8 Telltale Signs Its Time to Replace Your Furnace The Age of Your System. Rising Energy Bills. Excessive Dust, Dirt, Soot or Rust Particles. Home Humidity Problems. Rooms are Heating Unevenly. Furnace Becomes Unusually Noisy or Develops Rattles, Buzzes or Hums. Furnace Has Visible Signs of Rust or Cracks in or Around System. Frequent Repairs. Additionally, what happens when your furnace goes out? Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won’t warm up. If the blower is running but no heat is coming out, replace the filter. Secondly, how long do furnaces usually last? While some furnaces can last over 40 years (extremely rare), the average lifespan of a typical gas furnace is around 15-30 years. As long as you have scheduled yearly furnace maintenance, your furnace should easily last over 15 years.How do you know if your furnace is working?Turn your furnace off immediately if you smell burning odors other than dust and call your HVAC provider for immediate service. In good condition. Your gas furnace should show no signs of wear, rust, soot, or dirt deposits. When your furnace runs, the color of theflame inside the burner should be blue.