A furnace filter should be changed about once every three months. A furnace filter should be changed more often in the event of pollen, construction dust, cold spells, or other amplifying factors.
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Mistakes you're making when choosing a HVAC air filter (and how to choose the right one)
When you think of your HVAC system, you'll probably think of your furnace and air conditioner first. Your air filter may not get much praise, but it's just as important as either of those juggernauts ...
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