If the problem persists, I would collect some of the dust and determine if it is fibrous and spongy, or granular. If it is fibrous, it is probably attic insulation that is breaking down. If it is granular, it is probably coming from construction, such as maybe the tile cutting or grout installation or ceiling texture spray. You may want to remove some of your supply registers and see if there is dust in the duct. You could also show the powder to an AC contractor and get another opinion. Good luck.
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