radiator flush service

My a/c unit in the condo we just bought has a permanent air filter and a disposable.. is both necessary?

The unit is a couple of feet off the ground in a closet. the permanent filter was black, as it didn't look like the previous owners had cleaned it at all. Instead they put a disposable filter in the vent coming out of the closet. I cleaned the permanent


Common sense dictates that the more and better filtering available, the less crud gets to the evaporator coil. Bottom Line. If there's any way to keep both filters intact without impeding air flow, by all means, do it.

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