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Thread: AC filters

  1. #1
    Join Date
    Jun 2013
    Posts
    30

    Default AC filters

    Hi folks, what are your thoughts on having 2 ac filters- one at the bottom of the ac box inside the house & one below it a few inches away behind a wall grill-- Would having 2 filters cause the ac to work too hard or would it increase the electric bill? Thanks.

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,762

    Default Re: AC filters

    Having two filters is a bad idea.

    If it were a good idea, don't you think that equipment manufacturers would have recommended it?

    Moreover, using a thick filter, one of those $25 filters which advertise to stop allergies, is the equivalent of hooking a trailer to a small car like smart for 2.

    So what filter to use? I use the thin filters that cost 99 cents and REPLACE THEM ONCE A MONTH. I also clean and vacuum the dust in the area where the filter is located.

  3. #3
    Join Date
    Dec 2007
    Location
    Tennessee
    Posts
    1,791

    Default Re: AC filters

    Agree with only using one filter, disagree on the allergen filters. You will find that while, per square inch of media, the allergen filters are more restrictive, the allergen filters have many more pleats that are closely spaced. If you unfold all the pleats in an allergen filter, you will find that it has 3-4 times (or more) the filter surface area of the cheap filters. However, I'm not sure the allergen filters are all that effective unless the house is built really tight and the duct system is very well sealed up.

  4. #4
    Join Date
    Aug 2007
    Posts
    7,243

    Default Re: AC filters

    I have used a double filter system, and it worked quite well. I do want to emphasize what the others have said about restriction of air flow, it is a bad thing.

    In my situation, I had a furnace with an intake at floor level in a high traffic and high dust/debris area. In this location I installed one of those cheapy, blue "wooly" type filters that have zero restriction and are only good for catching rocks, gravel, and small children from entering the duct. In the furnace itself, I used pleated filters to catch all the dust and smalls that the primary missed. I had good luck with this, with no detriment to the system.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  5. #5
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,762

    Default Re: AC filters

    In addition:

    The only situation where I would have two filters: when I have two returns with filters mounted right there.

    The key is to change the filter on time.

    Most a/c failures are the result of dirty filters.

    If you have a tenant, go and replace the filter yourself, because some tenants will remove the dirty filter and leave the system filter-less. You don't want that.

  6. #6
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: AC filters

    Replacing the HVAC filters for your tenants also gets you into the apartment once a month to see what's going on

  7. #7
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,762

    Default Re: AC filters

    Quote Originally Posted by HoustonRemodeler View Post
    Replacing the HVAC filters for your tenants also gets you into the apartment once a month to see what's going on
    Believe me, I don't want to see the tenants' homes and their possessions inside, But I do care about the a/c equipment, so I zoom in n out.

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