Below are information for semi permanent non-disposable air handler filters. Both these filters are washable and both have a 5 year warranty.
We elected to go for the Filterama EZ-2000 electrostatic filter http://filtera.stores.yahoo.net/ezelairfil.html. This filter is on sale for $49.50 pus $1.00 shipping if ordered on the internet.
Another higher even higher rated non disposable filter is the Riteair Boair electrostatic filter http://www.riteair.com/esffeatures.htm?bs=&pn=/filtercat.htm&ps=www.riteair.com&si=27cc466ace9a3c46dd12627f295dc84f&ai=00020019. It is on sale for $75.96 plus shipping.
Our air handlers in the one bedroom lofts are Goodman 1.5 ton capacity and take a non standard 14 X 18 X1 filter. The U channel that holds the filter is a little generous and most filters are actually 3/8" less than the stated dimensions to allow for fit. Disposable filters are light weight and actually "suck up" to the air handler inlet frame. I'm not sure how this will work with the heavier aluminum framed non disposable filter -so I"ll shim it slightly to make it fit tightly against the inlet.
I'm pursuing PM options on our Goodman heat pumps.
