If it be me I would wire up a sail switch. Contact closed when the fan is on (hot air)and independent to the furnace.<BR><BR><BR>And yes, taping into the low voltage thermostat wiring would work ...
Relays are electromechanical devices that use a magnetic solenoid to actual a switch. When current is passed through the solenoid coil, it produces a magnetic field. The magnetic field is strengthened ...
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