G
you have got to have one of the following rare conditions going right for you.
1/ already clean ducts
2/ a very good slave/housekeeper/clean house
3/ no pets dragging in dirt and spreading around mites, dander, hair and or some either kind of particulate.
4/ all of the above
the dirtier those filters get the thicker they become trapping more airborne particulate making for a much less efficient appliance.....thicker filters create situations where the heating and cooling of your home takes longer and require more energy.
Regardless, all styles, types of filter require monthly maintenance unless you WANT to dust more and be more susceptible to upper respiratory illnesses. Hope this answers your question
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