differential temperature controller for attic fan [RE-wrenches]

[Kurt Albershardt]

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--On Thursday, July 22, 2004 6:41 AM -0700 "Bob-O Schultze, Electron Connection" <econnect at snowcrest.net> wrote:
>
> If you can use a standard 12" or 16" vertically mounted fan, you can buy them at Lowes, Home Despots, and most electrical supply houses with a thermostat already attached.

AFAIK these just turn on at a set temperature (which is what's already installed.)  Somewhere around 140º on and 120º off on most attic fans I've seen.  I'm looking for a way to keep the fan on as long as the outside air is 8-10º cooler than the attic.




> No way to reverse the flow, but why?

I'm looking to reverse the logic, so that in the Winter when the outside air is warmer than the attic air (mornings most likely) the fan can accelerate the warmup.




--thanks

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