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How regularly do you try to replace your Furnace Air Filters? You should change them once a month so that you can have pure air all through your air duct system and also keep your furnace operating efficiently. The more debris that clogs up your furnace air filters, the harder it has to run to get the air throughout the rooms. If you use central air conditioning, you should also take time to change the furnace air filters each month in the summer, also. If you do not have central air conditioning, you can get by with replacing them each month during the months when you use your heating. This will also slash your heating costs.