In article ,
says...

On Tuesday, November 1, 2016 at 4:44:04 PM UTC-4, Allie wrote:
replying to m Ransley, Allie wrote:
My filter is black after one month. Will never last a year. Theyre $30 each!
Didn't know it would be so expensive. Bet you would "rig" it too If you had to
pay that every month for a 5" filter.

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for full context, visit http://www.homeownershub.com/mainten...-5-155883-.htm

That thread is ten years old and Mr. Ransley hasn't been heard from in
a very long time. But maybe you can't see how old posts are because
your house is full of smoke and dirty air. It seems it would have to
be to turn a new 5" filter dirty in just a month. I easily go 2 years
on mine.

What kind of house is this in ? Must have a dirt floor to get the
filter that dirty that quick. I use the inexpensive 1 inch ones and
change them every 2 months. The first day of the odd numbered ones so I
can remember when to do it. They look as if they could go twice that
long, but at a buck or two each it is not htat expensive.

Had to have a man to work on the system a while back and while he was
here I let him talk me into cleaning the inside and outside coils. He
asked me if I had just changed the filter and cleaned the inside coils
as they were very clean. The filter was about a month old and the
inside unit was installed about 6 years before and never cleaned.

One thing that may help is that we never open the windows. As the wife
and I are both sensitive to pollen, we tend not to want much outside air
in the house.