It would help to know what year rig you have and what thermostat or thermostats you have. I'm going to take a guess that you have one of the newer thermostats and have two of them. If so you are looking at the wrong one. Only one thermostat controls the furnace and that one will also show a furnace mode and if you have it a heat pump mode. Just be sure when you have it in furnace mode that you have the fan set to auto.
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