I've been using an extra air filter in my central Heating/AC system.
Just inside the air return I mounted a 3 piece filter.
Piece: Desc Air Flows from 3 to 1
1: Hard plastic Mesh with 1" squares.
2: Thin Black Activated Charcoal filter.
3: Green fiberglass filter.

I don't know how you tell a filter is working or not. However after a
few months, I can see a large amount of "gunk" on the filter.

I was thinking of buying a IONIC BREEZE type filter. I found a small
one at Wal- Mart. It plugs in like a night light and has a night
light on it. After a few weeks of running this I get very little
"Gunk" on the metal bars. I don't know if this is an indication of
how a larger unit would work but this seems pretty worthless.

I've heard of "electrostatic" type filters that you put in your
returning air space. It doesn't plug in. The moving air is suppose
to generate a static field.
I also remember being at a friends home when I was younger and they
had an air filter (just inside the air return) that would !POP! like a
bug zapper.



In addition to the 3 Piece Filter I have in the air return, I also use
a pleated type filter in the , uh....normal place you would put a
filter in your Heating/AC unit.. This may be over kill, but I doubt
it.

Oh yeah, I also have 2 Wal-Mart upright HEPA air filters. Holmes
brand. They have a switch to make ions to help clean the air. I
don't know how well it works, but when I change the filters and clean
the unit, I get out a lot of dust. Of course, I get the same when I
blow out my computer with an air hose. Also, on both of the Holmes
units, the lights that tell you when the "IONIC" function is on, and
the lights telling you to change the filter are all non-working. They
all quit working early in the units life.

So far, the "3 piece system" I am using seems to be the best.
However, I would like to hear comments from the very knowledgeable
people in this group. Any advice, suggestions comments?

Thanks Everyone
RON in