Andy,
That link is a great one. I wish I'd found that site a long time ago, since while poking around I found the solution to a problem I had last winter. After I sealed up the gh for cold weather, every time the exhaust fan came on the intake shutters could not open against the vacuum caused by the fan draw. I was having to crack the manual vent each morning to allow the venting system to work when it came on, which is needed on all sunny days here, even in January. We looked for a delay circuit to delay the fan, but the only type that would work was very expensive. But the two stage thermostat offered here should do the trick nicely.
Good info on the misting systems, too, BTW!
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