re: When did A/C air filters get so dang expensive?

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When they switched to the pleated paper filters.

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They are better for allergies but don't they put a lot of strain on the a/c from the reduced airflow and are not as efficient as the old kind?

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You can still get the old style fiberglass ones at any local hardware store.

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Even those are still super high unless you buy in bulk. Also, if you have an odd size the filters are almost $7/filter