I'm putting in a Outdoor Wood Boiler system. I need to connect a Line Voltage thermostat to my existing forced air furnace fan and need assistance. I will be keeping the low voltage thermostat operational to use my propane system when I'm away. Obviously I'll be running a 12/2 line from the thermostat down to the furnace area, but I'm not sure what to connect the wires to. Could someone give me a clear idea on this procedure?