Would be wicked if it was one of those passive cooling systems that create movement of air just via temperature differentials

That wouldn't necessarily be silent though.

	▲	PeterStuer 4 days ago \| parent \| next [-]
		Passive convection flows would not be audible.
	▲	ses1984 4 days ago \| parent \| prev [-]
		It’s more likely to be quieter than a fan.