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So are you saying that since I don't see any heavy dust caked up on the evaporator, it's good? I can't see it that well so there might be a light coating of dust, but the spaces between the fins look...

A few years ago we bought a Carrier furnace for our house. It came with a blue washable filter. The prior system used regular pleated filters. Should this one be able to use a Filtrete or similar?
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