How often should I change my furnace filter?

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This is the one thing that an owner can do to increase the life and efficiency of a furnace and A/C system.  The filter is the number one culprit of causing maintenance problems and system failures.  It is recommended that the furnace filter be changed once a month.  However, if you remove the filter and hold it up to a white light and it doesn’t look opaque then you can change it every 3 months.

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