I have a 1987 manufactured home. I recently installed a 2001 propane forced air furnace. Even more recently I purchased an outdoor wood gasification boiler, Empyre, by pro-fab. I have everything hooked up and it provides excellent heat, however I am at a loss for the second thermostat installation. My existing thermostat only has two wires, red and white. I would like the second thermostat to only control the fan, (thermostatically), i.e. turn on the fan when the thermostat calls for heat