Well, since the pc fan is running off 12V, you could probably take a hydgro with a low humidity warning light or something like that, and use the wiring to the light to trigger a relay that would start the fan? Build a little black box out of some lexan or plexi to hide it in so it doesn't look like arse.
(I'm not an EE, but I build car stereos as a hobby so I've done a bit of 12V wiring.)
Oh and it would probably have to be a normal type bulb, I'm not sure the power going to an LED would be enough to trigger a 12V relay.
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