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Miscellaneous
When do i have to change the furnace filter?
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As per the owner’s manual for your furnace. Usually once every 90 days unless you notice more dust in the house or the furnace running more than usual.
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The only way to be sure about how often to change your air filter is to perform a visual inspection of the filter every month. After a few months, you’ll get an idea of how quickly it becomes dirty. You’ll need to re-evaluate if you get a new pet or if the outdoor air quality has been poor.
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