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    How often should we be changing our furnace filters? Especially now that everyone is in isolation because for the Covid-19 virus?

    Pros DIY

    Hi redplaiddevelopments, great question! A good rule of thumb is to change 1-2 inch thick every three months, 4 inch thick every six months and 5 inch thick every 12 months. This rule of thumb can vary drastically depending on a number of factors:

    • Microparticle Performance Rating (MPR): The larger the number the finer the particles the filter traps and therefore has to be changed more frequently.
    • Run-time: The amount of time that air is being forced through the filter. Colder climates and areas that run air conditioning will have long run-times.
    • Outdoor air quality: Dust from road construction or pollen floating in the air in Spring.

    Since all of these factors can effect furnace filter replacement times, I recommend visually inspecting the filter once a month, and replacing as needed. Another great indication that the filter requires a replacement is that when the fan on the furnace kicks on it whistles. This is caused by a clogged filter and the fan/blower pulling air from the gaps in the sheet metal.

    Thanks for the question and stay safe my friend.


    Ok thanks! I gotta grab some more filters.

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