Your furnace will typically last among 18 to 25 years, especially if regular maintenance is performed. But during this time, you may experience some problems that can be corrected without having to call in a professional. These gas furnace problems can be attended to if you know what causes them and how to fix the issue. You don’t have to have any vast knowledge of your system, and many of these gas furnace problems won’t cost much to get them taken care of either. For example: