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How often do you think about maintaining your furnace air filters? Most likely, you haven’t given it any thought at all. Were you aware that your furnace filter should be changed each month in order to keep your furnace running efficiently? The more clogged your filter becomes, the harder your ventilation system needs to work in order to feed the climate controlled air to the rooms in your house. In fact, it’s costing you on your heating bill if you are not keeping your filters cleaned. You will also need to replace your filters for your air conditioning during the summer months. If you only have a heating system that does not include central air, then you only need to change the filters during the winter months.