September 2012
Currently I am using two thermostats to activate an attic fan: one thermostat to determine a cool outside temperature and a second thermostat to determine the attic temperature. When the differential between the two reaches the set point of the two, they both turn on the attic fan, pulling cooler outside air up and through the attic. This only works when each thermostat reaches their "set" point temperatures. I would really like to be able to have the fan come on when a variable differential temperature — say 20 degrees — is reached, regardless of outside or attic temperatures; also, only if the attic temperature is warmer than the outside temperature.
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