How Often Should I Have My Chimney Cleaned?

So how often should I have my chimney Cleaned? According to the National Fire Protection Agency (Source: NFPA), ” a yearly inspection and cleaning and repairs done as necessary. Freestanding woodstoves or fire place inserts used to heat the home should be inspected and cleaned if needed every year. Regular, open fireplaces need to be maintained and cleaned on a consistent basis as well. Usually, a cleaning is needed for every cord of wood burned or at least 2-3 years.”