outlet on when thermostat on

JIMMIE wrote:

Assuming "heater" is furnace...
For furnaces that do not have an electronic control board, for a common circuit the fan relay is on when the thermostat is in "fan on" mode or when the thermostat calls for cooling. It is not on for heat. The plenum fan/limit switch controls the fan for heating.
Depends on whether the OP wants the aux fan to run on heating or cooling or both.

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