To get back to air movement, ionic wind with sufficient air movement to actually
cool something may not actually be very quiet. I found an article titled
Force on an Asymmetric Capacitor (US Army Research Lab).
Quote:
When the asymmetric capacitors have an applied DC voltage, and they are producing a net force
in air, they all emit a peculiar hissing sound with pitch varying with the applied voltage. This
sound is similar to static on a television or radioset when it is not tuned to a good channel.
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There's also a real video of a lifter flying
here and it's pretty loud, but I think most of
that noise is the ground electrode shaking, which won't happen if weight is not an issue.