I also have a train ac that is 9 years old. The origional filter never looked like it was getting dirty so i went and bought one of those filters that is supposed to last a lifetime . Its washable. Well the first one didnt look like it was getting dirty so i bought a different kind. I guess its just the way tranes work. I never have gotten a lot of dirt in any of the filters. I wash it out once a month when im using the heat pump with the air conditioning.
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