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Old 07-22-2008, 10:53 AM   #1
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Central air conditioner filters


I know you are supposed to have an air filter in your air handler unit, however, it is necessary to also have air filters in all of your air return vents?
Also, for the main filter, the package states to change every 90 days, but I read somewhere you should change them every 30 days, which is correct?

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Old 07-22-2008, 11:36 AM   #2
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Central air conditioner filters


If these filters are 3m I would get rid of them. Even new the restrict the air and will cause problems with your system. If you think about the logic behind the 90 days, if the filter better wouldn't they get dirty quicker?

A standard filter should be checked/replaced every 30 days.

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Old 07-22-2008, 03:36 PM   #3
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Central air conditioner filters


They are Filtrete filters. But again, do you ned filters for your return vents as well?
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Old 07-22-2008, 04:35 PM   #4
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Central air conditioner filters


Either you need one down by the furnace or air handler or you need them in your return air grills. Not both places.

I would HIGHLY recommened that you do not use those filterette filters. If you would like a good pleated filter that will not cause static pressure problems go to your local heating shop. Even new those filters can cause problems. Paul Harvey has killed more HVAC equipment than he knows.
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Old 11-10-2008, 10:24 AM   #5
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Central air conditioner filters


Filters need to be changed when they are dirty. There is no set time when they need to be changed.

During the moderate spring and fall weather when the furnace is not on as much you could get by doing it every 90 days or even longer if your furnace is not on at all.

If the furnace is on a lot and you are in a dusty location then maybe every 30 days is not enough.

The bottom line is that you need to look at the filters during heavy usage and see just how much crap there is on there. I change mine out every 30 days or sooner during heavy usage times in really cold weather. During the spring and summer I can get by changing it once every 6 months cause the furnace is hardly ever on.
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