I would get a low priced thermostat, mount it somewhere near the wood burner, and wire the A/C function of the thermostat in parallel to the fan switch.(you can probably do this at the furnace). When the air temp near the wood burner gets high enough the new thermostat will think it's time for some a/c and turn on your fan, then turn off when the air temp goes down.
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If there are two ways to do a job always choose the hardest; it'll take twice as long but you will learn twice as much.
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