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.

Add Yahoo as a preferred source to see more of our stories on Google. For best results, plan to clean your home's air filters about once a month and replace them about every six months. Be sure to ...

Keeping your furnace clean is important in order to have it run properly in winter (or year-round if you have whole-house air conditioning). A clean furnace will burn less fuel -- thus saving you ...

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