Multiply the length, width and height of the room, that gets you the volume. Compare the volume to the manufactures specs. If its a weird shape, just over estimate the length and width.
this post was submitted on 22 Aug 2026
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They Did The Math
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You can buy one that is slightly oversized and it won't be an issue. An oversized AC is a problem, but dehumidifiers can run as needed. Not much calculating needed