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How often should you have your furnace serviced?
About once a year. A gas furnace should be serviced at least once a year, preferably, though, in both the spring and the fall. Annual maintenance, including a thorough examination and cleaning of the parts that commonly malfunction, like the air filter, the fan, the pilot light, and the heat exchanger, can usually prevent these problems.
Do furnaces need to be serviced?
All furnace manufacturers recommend annual maintenance to be performed by a qualified technician. There is also verbiage in their warranties saying that any damage done to the unit because of lack of maintenance will not be covered.