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Passive stuff would be things like double skin the roof, so there's an air gap between the top skin and the roof you have now. What sort of obs do you have? Roll off roof or dome?
If you want to be a little less passive, what about a solar exhaust fan? I was considering one for my POD but I see the links to the solar fans are gone from the POD website, so I guess the opinion is the dome covers they sell are more effective. Google for 12V solar exhaust fan. There are some good options in the range of $90 to $170 for fully self contained solar panel and fan extractors.
Of course, there's always the brute force method of installing air con...
Al.
Last edited by sheeny; 28-11-2009 at 11:49 AM.
Reason: add detail
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