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Old 05-13-11, 07:29 PM   #3
Lex Parsimoniae
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You could add a temperature controlled switch in series with the fan's power line..

Attic fan thermostat 85F thermal switch solar electric - eBay (item 190527871313 end time May-28-11 21:53:37 PDT)

I've used these type switches on heat-sinks to kick on the fan when they got over 100 deg F.

You might be able to find something similar in an automotive supply store..
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