How to Change Your Furnace Filter

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Ensure you have the best quality air in your home by following these simple steps on a seasonal basis.
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CommentsComments on "How to Change Your Furnace Filter"
Do you keep an eye on your furnace or AC maintenance, or do you let the pros do that for you? Tell us about it below. 


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margie d. from Hopedale, MA on 10/26/2009 at 06:35 AM MT
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you can also put the date on the out side of the filter so you know when you last did it and then make sure you mark your calendar as soon as your done when it i s time to do it again. always buy extra when you go shopping for it. I always buy 4 for the yr. and this way i know when it needs to be done cause I mark the boxes when they should be done the next time Margie D.
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Charles S. from Jarrettsville, MD on 10/29/2009 at 09:58 AM MT
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Great tips! One minor thing. When you mention the air moving from the filter, in air conditioning mode, you say it then goes through the compressor. It actually goes through the evaporator. Another great tip is to install an air filter gauge. They are inexpensive and can quickly pay for themselves by either preventing throwing out a perfectly good filter, or by saving your blower motor from laboring too hard due to a dirty filter. Generalaire makes such a device. With shipping I paid $25.00. It simply measures air plenum pressure as the filter gets dirty. It is very easy to install. I remotely mounted the gauge where I can easily see it as my air handler is in the attic. Now I do not have to rely on "guessing" when to repkace a filter. Manufactures do not say to replace "every" 90 days, they sugeest replacing "up to" 90 days. In my case, the blower runs less in the Fall and Spring and more in the Winter and Summer. The MERV rating of the filter is also important to consider. The higher the number, the better it filters. If your system is not set-up for a high MERV filter, don't use the higher number. Usually a MERV 8 is more than sufficient.
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mark s. from Woodridge, IL on 01/30/2010 at 10:12 PM MT
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I use MERV 8 filters and replace on 4-month intervals.  I was told by my HVAC engineer if I do not use MERV 8 filters, to use the cheapest filter I can find.  He said that marketing in stores such as Lowes/Home Depot try to sell you high-end "allergy catching" filters.  He said these just "choke" the airflow in the system.  He said the main purpose of the filter is to protect the internal components, such as blower wheel, and furnace coils.  He said its air quality properties are secondary. <br /> <br />Also, I run my blower 100% of the time year-round.  My HVAC engineer said it keep are circulating through the home even if the A/C or furnace burners are not running.
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Henri J. from Decatur, GA on 01/03/2014 at 09:50 AM MT
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I cried unto God with my voice, even unto God with my voice; and he gave ear unto me. Psalm 77:1 I am renting this house and the manager says its my responsibility to have the filter change.
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Henri J. from Decatur, GA on 01/03/2014 at 09:50 AM MT
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I cried unto God with my voice, even unto God with my voice; and he gave ear unto me. Psalm 77:1 I am renting this house and the manager says its my responsibility to have the filter change.
Thumbs Up / Thumbs Down 1 of 1 Liked this Comment
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