As someone else stated be careful going to a higher restriction filter a lot of systems out there are installed with undersized return duct and undersized return filter grilles, you will get good service from the cheapo blue filters just keep them changed. If your system uses a run of duct over to the filter grille and it has a bad leak it will not matter what kind of filter media you use dirt is getting in between the unit and the filter. Cost hmm accessible in place CHEAP (less than 4k) Remove coil/clean reinstall VERY EXPENSIVE (still less than 4k LOL)
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