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Small-Scale Question Sunday for September 7, 2025

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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Is this a wall/window unit or central air? We have our wall units deep cleaned about once every two years or so. I don't know if it's planned obsolescence (or a racket) but the thinking is that Japanese wall units get a lot of crud that needs flushing out and otherwise gets breathed in and can cause irritants to those sensitive. This even when you run the self clean mode and/or clean out the removable filters.