The 4 Most Common Furnace Problems that Need to be Addressed When the winter and cool fall approach, homeowners prepare their furnaces for this season. Without a furnace or a heating system, it is almost impossible to survive in such chilled temperatures. Unfortunately, there are some common problems with a furnace that can cause inefficient functioning or low heating. If these problems occur then you need to address them so that the operation and functioning of the furnace can be improved.