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.

Q: How often should I replace the air filters in my home, and what factors would require me to replace them in between regular changes? A: The essential function of an air filter is to clean air that ...

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Q: Can you tell me why it is so important to install the air conditioner filter in a certain direction? What harm, if any, does it do if it's backwards? My husband always puts it in backwards. — Nancy ...