Is it time to change your furnace filter?


Part of your home’s preventative maintenance this fall should include changing your furnace filter. A clogged filter reduces airflow, which costs you money by reducing how efficient your system is, and that means higher electricity bills and reduced lifespan of your furnace.  Here are more tips to reduce your energy bill.


To avoid higher energy costs and/or expensive repairs, please ensure:

1. Your furnace filter is examined monthly and replaced every 90 days (check the manufacturer’s recommendations for full details). Try adding a reminder to your calendar for the first day of each quarter.

2. Keep your cold air return registers clean and unobstructed.

Keep in mind that some filters perform much better than others. See my video for details.  


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6 Responses to “Is it time to change your furnace filter?”

  1. Calvin Clarke says:

    I have a “Dust Fighter” DFGold filter on mnu furnace. You demonstrated in your video the necessity to replace and the frequency of $10-$15.00 filters. How about the DFGold type of filters?.

    • Dave says:

      Hi Calvin,

      I would suggest you look at what the manufacturer recommends for your particular furnace. The manufacturer should have suggested the maximum MERV rated filter you should be using and you can base your purchase on that.


  2. Alan says:

    Why are there arrows on the filter? The filter looks the same from both sides, so why is there a requirement for them to be placed in a certain direction?

  3. Bruce says:

    Hi Dave.
    You quickly mention the different price/quality of different filters.
    I’ve had SO many conflicting reports that I’m left not knowing which one is the best buy.
    I’ve been told not to waste my money on the expensive ones that the cheapo’s are all you need and vice versa.
    I have used the cheap ones and find they don’t seem at all dirty even after 90 days (still checked every 30)
    Interested in your thoughts…

    • Dave says:

      Hi Bruce,

      Here is a link with details on filters that I posted in September that might help. As for cheap vs more expensive I would try both. If the cheap one isn’t getting dirty but the more expensive one is; I would stick with the more expensive one because it’s doing what you want it to do. The furnace manufacturer should have suggested the maximum MERV rated filter you should be using and you can base your purchase on that.


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