Winter is prime time for furnace issues, which makes sense considering the added strain people put on their systems during this time of year. As you rely on your furnace to keep your home warm, it is recommended that you be especially aware of any signs that might indicate a problem with it. One of the most obvious signs that your furnace is experiencing issues is the presence of strange noises during operation. Have a look at some of these weird furnace noises, what they mean, and what you can do about it.